Received 19 January 2016; accepted 19 April 2016; published 22 April 2016
Nowadays, software organizations are immersed in very competitive markets. This situation challenges organizations for paying special attention to the quality of products and services offered to consumers. Moreover, organizations should take into account the selection of the best resources aimed at impacting positively into their processes, knowing beforehand that resources and processes influence the quality of their products and services.
In this direction, the ISO 25010 standard  states that: “the software lifecycle processes (such as the quality requirements process, design process and testing process) influence the quality of the software product and the system. The quality of resources, such as human resources, software tools and techniques used for the process, influence the process quality, and consequently, influence the product quality. Software product quality, as well as the quality of other components of a system, influences the quality of the system. The system quality has various influences (effects) depending on the contexts of use. The context of use can be defined by a set of a user, a task, and the environment”. Figure 1 illustrates these relationships as per ISO.
Consequently, software organizations that perform quality assurance activities should have a well-established quality evaluation and improvement approach in order to fulfill measurement, evaluation, analysis and change project goals. Project goals, particularly, information need goals may have specific purposes such as to understand the current quality state of an entity, to compare different entities for knowing their strengths and weaknesses, to improve the quality of an entity, to select the most suitable entity among a set of alternatives, etc.
Regarding the above, this article discusses the evaluation and improvement of an entity, particularly, a resource, using a holistic quality evaluation and improvement approach  . The architecture of this approach is based on two pillars, namely: 1) a quality multi-view modeling framework; and 2) ME/MEC integrated strategies. The first pillar specifies an ontology of quality views including terms such as entity category and quality focus and their influences and is determined by relationships as shown in Figure 1. This ontology allow us to represent quality views, for instance, the Resource Quality View, the Process Quality View, etc. in a more formal way than in  .
The second pillar provides a set of ME/MEC strategies, which helps software quality assurance (SQA) leaders to get data and information for analysis and decision-making in addition to achieve the information need goals for projects. Strategy is a frequently used and broad term, so for our purposes, we have defined it as: “principles, patterns, and particular domain concepts and framework that may be specified by a set of concrete processes, in addition to a set of appropriate methods and tools as core resources for helping to achieve a project goal”  . Furthermore, we have conceived that a strategy   can be represented with three capabilities, namely: (1) the ME/MEC domain conceptual base and framework; (2) the process perspective specifications; and, (3) the method specifications. These three capabilities support the principle of being integrated  since, for instance, the same ME terms are consistently used for activities and methods.
Additionally, in the last decade we have earned experience in developing a couple of specific ME/MEC strategies. For instance, we have developed the GOCAME (Goal-Oriented Context-Aware Measurement and Evaluation) and SIQ in U (Strategy for Improving Quality in Use) strategies, in 2008 and 2010 respectively. These strategies were applied in several concrete evaluation and improvement projects such as documented in   -  . For these ME/MEC projects, one or two quality views were considered. Also, both strategies have the three above-mentioned capabilities, which are supported in an integrated way.
On the other hand, we have envisioned the idea of packaging the earned experience in using ME/MEC strategies into strategy patterns. It is recognized that patterns have had and continue to have a significant impact in software and web engineering  -  . In a nutshell, the pattern’s main aim is to provide a general and reusable
Figure 1. Target entities and their relationships for evaluating quality (adapted from  ).
solution to a recurrent problem. We have observed that strategy patterns can be applied to recurrent ME or MEC problems/goals of any project. As a result, we specify a set of strategy patterns in a catalog that offers flexible and tailorable solutions for evaluating and improving the quality focuses for different entities in ME/MEC projects.
There are different categories of patterns documented since early 90’s, for example, object-oriented design patterns  , usability and architectural patterns  , analysis patterns   , among others. However, strategy patterns have recently been documented in  . Specifically, a ME/MEC strategy pattern includes in its structure a set of generic ME/MEC process and method specifications to be instantiated for a particular purpose and context. The patterns’ catalog and a potential recommender tool may support to the SQA leader in the selection process. This means that for a particular ME/MEC project goal (which embeds in its statement the quality focus and the quality views), the selection of the most appropriate strategy pattern to be instantiated can be eased.
This paper is motivated by the fact of showing the evaluation and improvement process made on the GOCAME strategy throughout the time by using strategy patterns. Thus, GOCAME was considered a resource from the entity category standpoint, with an evaluation focus on the quality of its three capabilities. Particularly, we will illustrate the employment of two strategy patterns, namely: GoME_1QV (Goal-oriented Measurement and Evaluation for One Quality View) and GoMEC_1QV (Goal-oriented Measurement, Evaluation and Change for One Quality View) in two periods of the timeline as depicted in Figure 2.
As above mentioned, we have developed the GOCAME strategy in 2008. So later, at early 2009, we have decided to understand the quality of its capabilities compared with other existing integrated strategies. To this aim, we first instantiated the GoME_1QV strategy pattern. Using this pattern allowed us to understand and analyze the strengths and weaknesses that GOCAME had in comparison with other strategies. In that case study  , the purpose of the ME information need was to “understand and compare” the “Capability Quality” from the “SQA leader” user viewpoint. We have defined the Capability Quality characteristic as the “degree to which a resource is suitable and appropriate for supporting and performing the actions when used under specified conditions”. The entity category is an “Integrated ME Strategy” whose super-category is “Resource”. Also, GOCAME and GQM+ Strategies   were the two concrete entities to be assessed for the “Resource Quality” focus. This focus embraces the three required capabilities of an integrated strategy, which are represented by the “Process Capability Quality”, “Conceptual-Framework Capability Quality”, and “Methodology Capability Quality” sub-characteristics. The yielded results allowed us to understand their strengths and weaknesses. So in 2010, we saw the opportunity to plan actions for further improvements after analyzing the GOCAME weaknesses and some strengths of GQM+ Strategies that could be taken.
Regarding this, we have performed two cycles of improvements and re-evaluations, from middle of 2010 to early 2014, by instantiating the GoMEC_1QV strategy pattern. Improvements were achieved by performing evaluation-driven changes in the resource, i.e., in the GOCAME strategy. Therefore, the purpose of the ME information need was “Improve” from the same user viewpoint as before. Regarding the first improvement cycle attributes of the “Process Capability Quality” characteristic, which had benchmarked with low performance indicators, were changed and then re-evaluated to gauge the improvement gain. The second cycle was made as shown in Figure 2, where the major improvement was focused on attributes of the “Conceptual-Framework Capability Quality” characteristic, as we will discuss later on.
Figure 2. Timeline for the development and improvement of the GOCAME strategy.
Hence, the main contribution documented in this paper is the instantiation of two strategy patterns for the evaluation and improvement of GOCAME with regard to the quality of its three capabilities.
Following this Introduction, Section 2 describes related work addressing research that deals with holistic evaluation and improvement approaches, and strategy patterns as well. Section 3 gives a background for understanding our holistic evaluation approach. Also, it shows the relations between Resource Quality View with others quality views. Section 4 discusses ME/MEC strategy patterns in general addressing the specification of GoMEC_1QV in particular. Then, Section 5 illustrates the GOCAME case study instantiating both GoME_1QV and GoMEC_1QV strategy patterns. Finally, Section 6 draws our main conclusions and outlines future work.
2. Related Work
In this paper, we outline and exemplify a holistic quality evaluation and improvement approach whose architecture is based on two pillars, as commented above: 1) a quality multi-view modeling framework; and 2) ME/MEC integrated strategies. Additionally, a set of strategy patterns for this approach are introduced and two are instantiated with the aim of improving an organizational resource. So, we analyze below the state-of-the-art research literature with these three concerns in mind, i.e., the two integrated pillars and strategy patterns.
Regarding the first pillar of the approach, there exists research that deals with quality views and quality models. But as far as we know there is no work defining and specifying an ontology of quality views, nor an explicit glossary of terms. One of the most relevant documents previously cited is the ISO 25010 standard, in which different quality views and their “influences” and “depends on” (or “is determined by”) relationships are informally represented (see Figure 1). Also, the explicit meaning of the quality view concept is missing. Moreover, there is no clear association between a quality focus and an entity category, nor explicit definitions of the different entity categories as we do in Table 1. Rather, ISO 25010 outlines views in the context of a system quality lifecycle model, where some views can be evaluated by means of the quality model that the standard proposes.
Another initiative related to quality views is analyzed in  in which just the “influences” relationship between External Quality and Quality-in-Use (QinU) characteristics is determined by means of Bayesians networks, taking as reference the ISO 9126-1  standard (this standard was superseded by  ). However, it does not discuss a holistic quality evaluation approach that links quality views with ME/MEC strategies, as we are proposing. Finally, in  the 2Q2U (internal/external Quality, Quality in use, actual Usability, and User experience) quality framework is proposed. This framework extends the quality models defined in  adding new
Table 1. Ontology of quality views: Term definitions.
sub-characteristics for EQ and QinU, and considers the “influences” and “depends on” relationships for three quality views, namely: Software Product, System and System-in-Use Quality Views. But there is no explicit quality view component specified, as documented in  and in the next Section.
Regarding the second pillar, i.e., ME and MEC integrated strategies, there exists a couple of related work. For example, Goal Question Metric (GQM)  , Continuous Quality Assessment Methodology (CQA-Meth)  , Practical Software Measurement (PSM)  , and Quality Improvement Paradigm (QIP)  . Particularly,   presents GQM+ Strategies, which is built on top of the so-called GQM strategy. Both strategies include the principle of the three integrated capabilities of a strategy  . But none consider the quality views’ concepts and the “influences” and “depends on” relationships, nor the ME/MEC strategy pattern idea.
Summarizing the approaches, CQA-Meth is a flexible methodology that allows the quality assessment of any software model. This methodology and its tool are part of the CQA integrated environment that can be used by companies to perform quality assessments of their own or third-party products. CQA-Meth defines the processes necessary to carry out the evaluation of UML models, and facilitate communication between the client (sponsor of the evaluation) and the evaluation team. CQA-Meth lacks an explicit conceptual framework from a terminological base standpoint. While CQA-Meth comes from the same research group who developed the FMESP (Framework for the Modeling and Evaluation of Software Processes) approach  which does have a conceptual framework with an ontological base as indicated by authors in  , the relationship among the three capabilities is not explicit at all.
Other measurement approach widely accepted in the industry that helps manage software development projects is PSM. It is an information-oriented approach that describes a software measurement process, also being part of a comprehensive management program and software development project management. PSM describes how to define and integrate measurement requirements, collect and analyze measurement data and implement the entire measurement process in an organization. PSM was one of the sources for the development of the ISO/IEC 15939standard  (as indicated in http://www.psmsc.com/iso.asp), and after the formal appearance of this document, PSM was updated according to this standard as well. Another related work is the QIP paradigm, whose premise is that improvement is a continuous process. This approach helps organizations to implement a continuous improvement process taking into consideration past experiences. Therefore, QIP is beneficial in mature organizations that are aware of their learning processes and experiences. QIP uses GQM for defining goals and appropriate metrics that will guide the implementation of the process. While this paradigm is consolidated as a continuous improvement approach, it does not offer an integrated guide for measurement, evaluation and change projects. Moreover, the three capabilities of most of these strategies are not well specified in an integrated way.
Lastly, regarding the third concern, a lot of research deals with patterns. There is plenty literature about design patterns  , analysis patterns   , architectural and usability patterns   , language patterns  , among other categories and issues. But this literature is, to the best of our knowledge, not intended to measurement, evaluation and improvement processes and stages in which quality views and ME/MEC strategy patterns could be used accordingly. For example, authors in   define a framework that expresses relationships between Software Architecture and Usability (SAU). This proposal consists of an integrated set of design solutions that had been identified in various industry cases. However, in our opinion, a clear separation of concerns among quality views, quality models, ME/MEC integrated strategies and strategy patterns is missing.
3. Outlining the Holistic Quality Evaluation and Improvement Approach
As indicated above, the architecture of our holistic quality evaluation and improvement approach is built on two pillars. Sub-section 3.1 discusses the first pillar, i.e., the quality multi-view modeling framework, which specifies the proposed ontology of quality views and the grouping of its concepts into the quality_view component. Sub-section 3.2 analyzes, as part of the second pillar, what an integrated strategy for the purpose of evaluation and improvement is.
3.1. Quality Multi-View Modeling Framework
On one hand, a ME/MEC project can involve one or more entity super-categories such as Resource, Process, Software Product, System and System in Use. Each entity super-category is evaluated considering its corresponding quality focus such as Resource Quality, Process Quality, Internal Quality, External Quality and QinU. The relationship between an entity super-category and its quality focus is called Quality View. For example, the Resource entity super-category and the Resource Quality focus conform the Resource Quality View. On the other hand, for each quality view an appropriate quality model must be instantiated, as part of the definition and evaluation of non-functional requirements for a ME/MEC project. A quality model has a quality focus (the root characteristic) in addition to characteristics and sub-characteristics to be evaluated which combine measurable attributes. So the quality multi-view modeling framework embraces concepts such as quality view, quality model, relationships between quality views, among other issues.
Next, we describe the quality multi-view modeling framework pillar considering the proposed domain ontology for quality views and the linking of the new quality_view component with the previously developed C- INCAMI (Contextual-Information Need, Concept model, Attribute, Metric and Indicator) conceptual framework  . C-INCAMI explicitly and formally specifies ME concepts, properties, relationships and constraints, in addition to their grouping into components. This domain ontology for ME was also enriched with terms of a process generic ontology  .
An ontology is a way of structuring a conceptual base by specifying its terms, properties, relationships and axioms or constraints. A well-known definition of ontology says “an ontology is an explicit specification of a conceptualization”  . On the other hand, van Heijst et al.  distinguish different types of ontologies regarding the subject of the conceptualization, e.g., domain ontologies, which express conceptualizations that are intended for particular domains; and generic ontologies, which include concepts that are considered to be generic across many domains. Regarding this classification, the quality views ontology can be considered as a domain ontology since its terms, properties and relationships are specific to the quality area. However, some terms like entity super-category can be considered generic. Figure 3 depicts the quality views ontology using the UML class diagram  for representation and communication purposes.
Figure 3. Terms and some instances of the quality views ontology.
The relationship between an Entity Super-Category and its associated Quality Focus is the Quality View key concept in our ontology. A Quality View is a Calculable-Concept View just for quality. Instances of the Quality View term are Software Product Quality View, System Quality View, System-in-Use Quality View, Resource Quality View and Process Quality View terms, as shown in Figure 3. It is worth mentioning that in the figure not all instances of quality views are shown, as for example the Service Quality View. Additionally, its relationships are defined in Table 2. (Note that these two tables have updated definitions compared with  ).
Also, Figure 3 shows that instances of Entity Super-Category are Software Product, System in Use and Resource, amongst others. On the other hand, a Calculable-Concept Focus can be for example a Quality Focus or a Cost Focus. Note that Cost Focus and Cost View are not directly related with the quality domain, so they are gray-colored terms. Some instances of Quality Focus are Resource Quality, Process Quality, etc. Table 1 defines Resource Quality as “the quality focus associated to the resource entity super-category to be evaluated”. This quality focus and its instantiated quality model will be illustrated in Section 5.
Figure 4 shows the influences and depends on relationships between instances of quality views which are commonly present in development, evaluation and maintenance projects. Thus, the Resource Quality View influences the Process Quality View. For example, if a development team uses a new strategy or method―both considered as entities of the Resource Entity Super-Category-this fact impacts directly in the quality of the development process they are carrying out. Likewise, the Process Quality View influences the Software Product Quality View, and so on. Conversely, the depends on relationship has the opposite semantic.
Lastly, note that the quality views ontology shares some terms with the ME ontology presented in  . Particularly, an Entity Super-Category is an Entity Category, which is a term from the non-functional requirements component in Figure 5. Entity Category is defined in Table 1 as “the object category that is to be characterized by measuring its attributes”. Also, a Calculable-Concept Focus is a Calculable Concept and represents the root of a Calculable-Concept Model. In Table 1 a Calculable-Concept Model is defined as “the set of calculable concepts and the relationships between them, which provide the basis for specifying the root calculable-concept requirements and their further evaluation”. As a result, in Figure 5, the new terms are grouped into the quality_view component which are linked with the former C-INCAMI non-functional requirements component. Note also that many C-INCAMI components in Figure 5 are drawn without terms for better visualization. In Figure 6, the measurement and evaluation components are expanded.
Table 2. Ontology of quality views: Relationship definitions.
Figure 4. An instantiation of typical quality views in software development projects.
Figure 5. The quality_view component which extends the C-INCAMI conceptual framework.
Figure 6. Measurement and evaluation components of the C-INCAMI conceptual framework enriched with process terms.
3.2. Integrated Strategies for Measurement, Evaluation and Improvement
Integrated ME/MEC strategies are the second pillar of our holistic quality evaluation and improvement approach. The fact of modeling quality views and their relationships is crucial for the aim of this pillar, since strategies are chosen considering quality views to be evaluated according to ME/MEC project goals.
In our approach, an integrated strategy simultaneously supports three capabilities  : 1) the domain conceptual base and framework; 2) the process perspective specifications; and 3) the method specifications. To the first capability, C-INCAMI explicitly specifies the ME/MEC terms, properties, relationships and constraints, in addition to their grouping into components. The second capability, the process specifications, usually describes a set of activities, tasks, inputs and outputs, artifacts, roles, and so forth. Besides, process specifications can consider different process perspectives such as functional, behavioral, informational and organizational  . Usually, process specifications primarily state what to do rather than indicate the particular methods and tools (resources) used by specific activity descriptions. The third capability provides the ability to specify methods, which ultimately represent the particular ways to perform the ME/MEC tasks.
These three capabilities support the strategy’s principle of being integrated  . Since, for instance, the same ME terms are consistently used for activities (what) and methods (how), as we highlight in the next Section.
4. Specifying Strategy Patterns
In Software Engineering, a well-known definition for pattern is “each pattern describes a problem which occurs over and over again in our environment, and then describes the core of the solution to that problem, in such a way that you can use this solution a million times over, without ever doing it the same way twice”  . That is, a pattern provides a documented and tested solution for recurring problems in similar contexts. Thus, we have observed that strategy patterns can be applied for ME/MEC projects’ recurrent problems. Strategy patterns offer flexible and tailorable solutions for evaluating and improving the quality focuses for different entities in ME/ MEC projects. The selection of a suitable pattern is made taking into account the goal and context of the project in conjunction with the intervening view or views, as seen in Figure 4.
GoME_1QV is a strategy pattern used to provide a solution in the instantiation of a ME strategy aimed at supporting just an understanding goal when one quality view is considered (e.g., Resource Quality View, Software Product Quality View, System Quality View, etc.). This strategy pattern must be selected when the project goal is just to understand the current situation of an entity with regard to the corresponding quality focus. The generic process of GoME_1QV consists of six activities, which are the A1-A6 gray-colored activities in Figure 7. This is the simplest pattern to be instantiated and the mostly used in ME projects we have run, e.g., in the evaluation of a mash-up application  and a shopping cart  . This pattern was also used to evaluate and compare GOCAME and GQM+ Strategies in 2010 (recall Figure 2). Also, its application will be commented in sub-section 5.1.
The GoMEC_1QV strategy pattern is applied when the project goal states that it is necessary not only to understand the current situation of the entity at hand but also to perform changes on it, re-evaluate it, and gauge the improvement gain achieved. It embraces eight generic activities, i.e., the A1-A8 activities in Figure 7. This pattern is instantiated for a MEC project goal considering just one quality view. We have illustrated GoMEC_1QV in a case study for improving the Usability of the Facebook app  , where the Usability characteristic was linked to the External Quality focus. This pattern is thoroughly specified next, and then instantiated in sub-sec- tion 5.2 for the Resource Quality focus.
GoMEC_2QV is another strategy pattern included in the catalog, which gives a solution for an improvement project goal which involves two quality views and their relations. Recall that between two quality views, the ‘influences’ and ‘depends on’ relationships can be used. This implies that one quality view plays the role of
Figure 7. Generic process from the functional and behavioral perspectives for the GoMEC_1QV pattern.
dependent view, while the other plays the role of independent view (see these roles in Figure 5). For example, if we consider the System Quality View and the System-in-Use Quality View, these relations embrace the hypothesis that evaluating and improving the EQ focus of a system is one means for improving the QinU focus of a system in use  . In turn, understanding QinU problems may provide feedback for deriving External Quality attributes that if improved could impact positively in the system quality. Furthermore, we can envision valid and interesting relationships for instance between Resource Quality View and Product Quality View. That is, by evaluating and improving the resource quality can be one means for improving the Internal Quality focus of a product. For example, changes in the development team can impact positively in the architectural design. SIQinU strategy  is an instance of this pattern. This strategy was used as case study in a real software testing enterprise with headquarters in Beijing, which examined JIRA (www.atlassian.com/software/jira/), a commercial software defect tracking system.
Below, the GoMEC_1QV pattern is specified considering a template with the items listed above.
Name: Goal-oriented Measurement, Evaluation and Change for One Quality View
Alias: GoMEC_1QV or GOCAMEC_1QV in 
Intent: To provide a solution in the instantiation of a measurement, evaluation, analysis and change strategy aimed at supporting a specific improvement goal of a project when one quality view is considered.
Motivation (Problem): The purpose is to understand the current situation of a concrete entity in a specific context for a set of characteristics and attributes related to a given quality focus and then change the entity and re-evaluate it in order to gauge the improvement gain, through the systematic use of measurement, evaluation, analysis and change activities and methods.
Applicability: This pattern is applicable in MEC projects where the purpose is to understand and improve the quality focus of the evaluated entity for one quality view, such as Resource, System, System-in-Use Quality Views, among others.
Structure (Solution): The pattern structure is based on the three capabilities of an integrated strategy viz, the specification of the conceptual framework for the MEC domain, the specification of MEC process perspectives, and the specification of MEC methods. GoMEC_1QV provides a generic course of action that indicates which activities should be instantiated during project planning. It also provides method specifications for indicating how the activities should be performed. Specific methods can be instantiated during scheduling and execution phases of the project. Below, we describe the main structural aspects of the three strategy capabilities.
1) The concepts in the non-functional requirements, context, measurement, evaluation, change, and analysis components (Figure 5 and Figure 6) are defined as sub-ontologies. The included terms, attributes and relationships belong to the MEC area. In Figure 6 we show just the main ME terms. Note that ME terms in Figure 6 are also enriched with terms from a generic process ontology  by means of stereotypes. These concepts are used consistently in the activities, artifacts, outcomes and methods of any ME/MEC strategy.
2) The process specification is made up from different perspectives, i.e., functional which includes activities, inputs, outputs, etc.; behavioral, which includes parallelisms, iterations, etc.; organizational, which deals with agents, roles and responsibilities; and informational, which includes the structure and interrelationships of artifacts produced or consumed by activities. Considering the functional and behavioral perspective, Figure 7 depicts the generic process for this pattern. The names of the eight (A1-A8) MEC activities must be customized taking into account the concrete quality focus to be evaluated.
3) The method specification indicates how the descriptions of MEC activities must be performed. Table 3 and Table 4 exemplify three method specification templates: the first for a direct metric used as method specification for direct measurement tasks; the second for an indirect metric, used in indirect measurements; and the third for an elementary indicator, used in elementary evaluations. Note that terms in method specification templates come from the ME conceptual base. Many other method specifications can be envisioned such as task usage log files, questionnaires, aggregation methods for derived evaluation, amongst others. For change activities traditional methods such as refactoring, re-structuring, re-parameterization, document updating, among others can be specified as well.
Known uses: GoMEC_1QV was used in a MEC project devoted to improve Usability and Information Quality attributes of a shopping cart, i.e, from the System Quality View through refactoring as change method  . Besides, this pattern was instantiated in a MEC project for the Resource Quality View  .
5. Illustrating Two Strategy Patterns for the GOCAME Case Study
As indicated in the Introduction Section, this paper is motivated by the fact of describing the evaluation and
Table 3. Method specification templates for the measurement task: a) direct metric; b) indirect metric.
Table 4. Method specification template for the elementary evaluation: elementary indicator.
improvement process made on the GOCAME strategy throughout the time. To this aim, we will illustrate the employment of two strategy patterns following the timeline shown in Figure 2.
5.1. Applying GoME_1QV
At early 2009, we decided to understand the quality of the GOCAME strategy. To this aim, we first instantiated the GoME_1QV strategy pattern. Using this pattern allowed us to understand and analyze the strengths and weaknesses that GOCAME had in comparison with other strategies. The evaluation was focused on the Capability Quality. This characteristic embraces the idea of to which extent a resource is suitable and appropriate for supporting and performing the expected actions. Capability Quality includes three quality sub-characteristics, namely: Process Capability, Conceptual-Framework Capability, and Methodology Capability. These sub-char- acteristics represent the principle of integratedness of a strategy.
The selection criteria used for the choice of the entities to be evaluated were: 1) ME strategies should be documented in the literature of public domain in English language, i.e., in digital libraries with recognized visibility such as IEEE Xplore, Springer Link, ACM digital library and Scopus; 2) ME strategies should have recognized impact in the academia or industry; and, 3) ME strategies should simultaneously support the three quoted capabilities. We performed a systematic literature review. At that time, there were many proposals published in the ME area having some strategies the three capabilities, but most were not in an integrated way. As a result, we included two concrete entities to be assessed: GQM+ Strategies and GOCAME. In this selection process, we disregarded FMESP, CQA-Meth, among others, as discussed in   .
Since the GoME_1QV strategy pattern was applied, we instantiated for the Resource Quality View the A1-A6 generic activities that the pattern structure provides. Next we describe each instantiated activity.
(A1) Define Nonfunctional Requirements for Resource Quality is the first instantiated activity. The yielded work product is the Nonfunctional Requirements Specification for Capability Quality, which includes the Information Need Specification, the Requirements Tree Specification, and the Context Specification.
The purpose of the information need is to “understand and compare” the “Capability Quality” from the “SQA leader” user viewpoint. The entity category is an “Integrated ME Strategy” whose super-category is “Resource”. GQM+ Strategies and GOCAME are the concrete entities to be assessed. The focus of the evaluation is “Resource Quality”.
Since in the related literature there was no official or de facto standard that would have specified the Capability Quality model, we had to define our own quality model. Table 5 shows, in the 1st column, the resulting requirements tree. The 1. Capability Quality characteristic includes the 1.1. Process Capability Quality, 1.2. Conceptual-Framework Capability Quality, and 1.3. Methodology Capability Quality sub-characteristics. Table 6 shows their definitions. Additionally, definitions of all sub-characteristics and attributes are in  , Appendix A.1.
The Process Capability Quality sub-characteristic is in turn composed of sub-concepts that represent how suitable are the activities, artifacts, process model and its perspectives, and process compliance as well. The suitability of activities and artifacts are measured by means of attributes that quantify the availability, completeness, granularity and formality aspects. On the other hand, process modeling suitability (see Table 5) consists of sub-characteristics that evaluate how adequate are the functional, behavioral, informational and organizational process perspectives, by means of attributes of availability, completeness and granularity. Finally, the process compliance sub-characteristic is related to the adherence of strategy processes with strategy conceptual base and standards.
The Conceptual-Framework Capability Quality sub-characteristic is in turn composed of sub-concepts that represent how suitable are the conceptual base and framework in addition to the terminological compliance. Finally, the Methodology Capability Quality sub-characteristic includes attributes for evaluating availability, completeness for allocating methods to activities, and the terminological compliance as well.
(A2) Design the Measurement for Resource Quality is the instantiated activity of the GoME_1QV strategy pattern, which produces the Metric Specification work product. This activity consists of selecting the meaningful metrics from the Metric repository (datastore stereotype in Figure 7) in order to quantify each attribute of the requirements tree. A metric represents the method to perform the specified steps to quantify an attribute.
For example, the indirect metric named “Degree of Activities Description Availability” (DADA) was selected for quantifying the “Activities Description Availability” attribute (coded 184.108.40.206 in Table 5). Table 7 specifies
Table 5. Full requirements tree where attributes are in italic in the 1st column. In the rest of the columns, the indicator values [%] are for the first (2010) and last (2014) evaluation of GOCAME, and the thrown differences.
Table 6. Definitions of the three capability quality sub-characteristics.
Table 7. Specification for the Degree of Activities Description Availability Indirect Metric.
this metric, which adheres to the method specification template of Table 3(b). Specifications of all metrics both direct and indirect are in  , Appendix A.2.
(A3) Implement the Measurement for Resource Quality is the instantiated activity of the quoted strategy pattern. For data collection, we used the most relevant documents for both GQM+ Strategies and GOCAME disregarding documents that were not co-authored by at least one member of the authors of the original research. Moreover, we gave greater priority to the most current documents when they represented a contribution with regard to previous ones. The outcome of this activity is a set of Measures. For the DADA indirect metric, the yielded value was31.91% for GOCAME, and 24.75% for GQM+ Strategies. These values are calculated following the calculation procedure of Table 7.
(A4) Design the Evaluation for Resource Quality is the name of the instantiated activity, which produces the Indicator Specification artifact. This activity consists of defining a set of elementary indicators for attributes. An elementary indicator maps a measured value to a new numeric or categorical value in order to interpret the satisfaction level met for a given attribute. Also derived indicators are defined, which are able to interpret the satisfaction level met by characteristics and sub-characteristics. Usually, derived indicators are represented by an aggregation model.
Table 8 shows the elementary indicator specification for the 220.127.116.11 attribute following the specification template shown in Table 4. Additionally, specifications of all indicators are in  , Appendix A.3.
In the case study, for the interpretation of indicator values, three acceptability levels in the percentage scale were used. A value between [0 - 50] represents an unsatisfactory acceptability level meaning that change actions must be taken with high priority. A value between [50 - 75] represents a marginal level meaning that improvement actions should be taken. While a value between [75 - 100] corresponds to the satisfactory level. For calculating derived indicators, the LSP (Logic Scoring of Preference) aggregation model  was used. LSP can be represented by the following equation:
where DI represents the derived indicator to be calculated; Ii stands for indicator value and the following holds 0≤ Ii ≤ 100 in a percentage scale; Wi represents the weights, where: W1 + W2 + ... + Wm = 1, and Wi > 0 for i = 1 to m; and, r is a LSP parameter  .
Table 8. Specification for the performance of activities description availability elementary indicator.
(A5) Implement the Evaluation for Resource Quality. From the measures obtained in the A3 activity and using the selected indicators in A4, the A5 activity was executed in 2010. Table 9 shows a fragment of results for both evaluated strategies.
(A6) Analyze and Recommend for Resource Quality is the last activity instantiated of the GoME_1QV strategy pattern. As a result, this activity produced the Recommendation Report artifact, which includes one or more recommendations for attributes that did not meet the Satisfactory level, i.e., for attributes with red-or yellow-colored indicator values. Improvement recommendations arise from GOCAME values with weak performance in addition to GQM+ Strategies indicator values with stronger performance. Although the global satisfaction level achieved for GQM+ Strategies (45.89%) is lower than GOCAME (66.48%), the former has some well-scored elementary indicators that can be taken into account when planning improvements for GOCAME. For example, if we compare in Table 9 the 18.104.22.168 Organizational Perspective Suitability values for both strategies, the recommendation for GOCAME can take into account the GQM+ Strategies strengths for this capability.
In summary, Table 9 shows that due to the 66.48 global value for GOCAME’s Capability Quality actions for improvement should be performed. Specifically, it can be seen that 1.1. Process Capability Quality is the only sub-characteristic which met a marginal value of 58.88%.Looking closer at its 1.1.1. Activities Suitability and 1.1.2. Artifact Suitability sub-characteristics, many attributes whose values are marginal or unsatisfactory must be changed.
Table 10 shows three recommendations given for the 22.214.171.124. Activities Description Availability attribute, which scored 31.91%. Note that the table also specifies the priority for change.
In conclusion, we have summarized the six activities belonging to the GoME_1QV strategy pattern. This case study first allowed us to understand the GOCAME strengths and weaknesses in 2010. From the issued recommendation report, we decided hereafter to perform changes for improvement. Using the GoMEC_1QV strategy pattern, we decided to perform two cycles of improvements. The first cycle for improvement was devoted to change the low benchmarked indicators for the 1.1. Process Capability Quality. While the second cycle for improvement was mainly devoted to change the 1.2. Conceptual-Framework Capability Quality by enhancing the ME ontology  . In the next sub-section, we describe the two new activities of the GoMEC_1QV strategy pattern by addressing the improvement cycle as a whole.
5.2. Applying GoMEC_1QV
This strategy pattern consist of a generic process with eight activities as depicted in Figure 7. As commented before, both strategy patterns share the A1-A6 activities. However, GoMEC_1QV has activities for planning and performing changes also being able to realize re-evaluation and improvement cycles.
In order to improve the GOCAME Capability Quality the A7 and A8 activities are instantiated. Now, the purpose of the A1’s information need is to “improve” the “Capability Quality” from the “SQA leader” user viewpoint. For repeatability and comparability reasons  , the used requirements tree, metrics and indicators were the same that in the first (2009) study. Table 5 presents the full requirements tree in addition to the yielded elementary and derived indicator values for the GOCAME evaluations in 2010 and 2014, respectively. Also in  was presented the yielded elementary and derived indicator values for the first (2011) improvement cycle.
(A7) Design Change Actions for Resource Quality is the next activity specified in GoMEC_1QV that should be instantiated for change. The work product of this activity is the Improvement Plan. A fragment of this artifact is shown in Table 11. Basically, per each recommendation (R) in Table 10, a set of planned change
Table 9. Fragment of the requirements tree with the yielded indicator values in [%] performed in 2010 for both GOCAME and GQM+ Strategies.
Table 10. Fragment of the Recommendation Report artifact generated in the instantiated A6 activity. (Note: H means High, i.e, an urgent action is recommended).
Table 11. Excerpt of the Improvement Plan artifact produced in the instantiated A7 activity.
actions (CA) are identified in addition to the CA source, and method type. Issues to take into account for designing the plan are for example: 1) the quality characteristics and sub-characteristic related to the capabilities of the entity to be improved; 2) the definition of attributes and metrics as well as the measured values that may help to identify the causes of the problem and their solutions; 3) the definition of indicators and their values in order to establish priorities.
(A8) Implement Change Actions for Resource Quality is devoted to implement the planned actions in the A7 activity. The produced artifact is a new version of the strategy. The last updated strategy was named GOCAME version 2. As commented above, changes were focused on the Process and Conceptual-Framework capabilities. Table 12 summarizes these changes.
After changes were implemented, the new strategy version was re-evaluated. To this aim, A3, A5 and A6 activities were performed again. Table 5 shows, in the 3rd column, the outcomes of the re-evaluation made in 2014. Note that results can be compared with the first GOCAME version (2nd column), since we used the same nonfunctional requirements, metrics and indicators specifications. The analysis activity conducted after the re-eval- uation shows that the Capability Quality increased 7.39 points (4th column) reaching to a some extent the goal of improving the GOCAME strategy. This gain stems from the significant increase in the Process Capability Quality (22.79 points), and to a lesser extent, in the increase of the Conceptual-Framework Capability Quality (2.51 points).
An unexpected result was in the Methodology Capability Quality indicator, which suffered a small decrease of 3.06 points. While changes were not performed on this capability, its indicator value was impacted negatively by changes made on the Conceptual-Framework Capability. One reason is that the new terms introduced in the conceptual framework were not totally spread out in the methodology.
As the reader may surmise, new improvement cycles to the GOCAME strategy using the GoMEC_1QV pattern should be planned, since the yielded value is still 73.87, which implies opportunities for enhancements.
6. Concluding Remarks
As commented in the Introduction Section, we have developed in 2008 an integrated ME strategy so-called GOCAME which relies on three capabilities: the C-INCAMI conceptual frame work, the ME process perspective specifications, and the method specifications. At that moment, after its development, we decided to understand the quality of this resource and compare it with well-established strategies such as GQM+ Strategy. In Section 4, we have thoroughly discussed a strategy pattern that is able to support evaluation-driven changes. We think that strategy patterns can be conceived as a new category of patterns, likewise analysis or design patterns are dealt as categories too.
Table 12. Main changes made to the process and conceptual framework capabilities.
Particularly, in Section 5, we have illustrated the instantiation of the GoME_1QV and GoMEC_1QV strategy patterns for a resource quality view. This resource is the GOCAME strategy, which can be used to support SQA activities. We have specifically analyzed the improvement of the GOCAME strategy after applying two improvement cycles, which drew a global gain of 7.39 points. Basically, the gain in the Capability Quality characteristic was achieved by changing some Process Capability Quality and Conceptual-Framework Capability attributes.
For the sake of concluding, a ME/MEC strategy pattern is a way of packaging general and reusable solutions for common and recurrent measurement, evaluation and change/improvement problems or situations for specific projects’ goals. Moreover, according to the project goal and the amount of involved quality views a strategy pattern should be selected and then instantiated.
As future lines of research, we envision the development of a strategy pattern recommender system as a practical use of the quality views ontology (illustrated in sub-section 3.1) in the context of our holistic quality evaluation approach. The recommender system can be useful when an organization establishes ME/MEC project goals. Hence, taking into account the type of project goal and the amount of involved quality views, the strategy pattern recommender system will suggest the suitable pattern that fits that goal. Additionally, we started to work on a conceptual base that links ME information needs with business goals, in order to be able to develop strategies that support goals at different organizational levels, such as operational, tactical and strategic. It is important to remark that this multi-level goal feature was not assessed in this study, even though it was an existing feature in the GQM+ Strategy approach.
Lastly, as mentioned in sub-section 3.2 an integrated strategy simultaneously supports three capabilities, being one of them the ME conceptual base and framework. We have discussed in    the rationale for introducing or adapting some terms from ISO 15939  . The terminology in  was widespread used in the new series of SQuaRE (Software Product Quality Requirements and Evaluation) documents and in many works such as    , to quote just a few. Considering this issue, we will review our ontology in order to evaluate the terminological adherence to SQuaRE documents.
We thank the support given by Science and Technology Agency of Argentina, in the PICT 2014-1224 project at UNLPam. Also, Belen Rivera thanks the support given by the co-funded CONICET and UNLPam grant.
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