The gap between psychotherapeutic research and the clinical praxis is broad, and this is particularly true for certain clinical approaches that—due to their theoretical principles and methodology—distance themselves from the empirical-positivistic methods of scientific research. This applies to Gestalt Therapy (GT), a humanistic and holistic approach based on phenomenology, which has suffered from a lack of scientific recognition over the years and from its focus mainly on practice and published papers that expressed the theoretical clinical point of view and the experience of the authors.
However, in recent years there has also been a growing awareness, even in scholars and clinicians of GT, of the importance and the need to give a scientific dignity to this clinical approach  . Therefore, certain studies, researches, and reports have been presented, often associating scientific recognition to the possibility of using empirical methods that respect the values, principles, and even the method proposed by this clinical approach. For instance, Doric  affirmed that it should be considered a form of art, that is, “intuitive, holistic, and dynamic” (pg. 46). In the past, certain researches assessed the effectiveness of GT, recognizing its utility, and as affirmed by Elliott, Greenberg and Lietaer  “this body of research is continuing to grow rapidly” (pg. 4).
In order to know the evidence for GT effectiveness in more recent years, it is important to summarize studies and researches that focused on a GT approach. As Fogarty  affirmed “If GT could establish its own evidence base, this would help GT both to claim its tradition and methods for itself and to receive the recognition and funding that these newer modalities are receiving” (pg. 45). Thus, in our systematic review, we focus on GT, and not on the integration of clinical models that used methods and principles of GT (such as Emotion-Focused Therapy) and we avoid considering papers focused on aspects, concepts, and principles of the Gestalt model, but refer to different clinical models. In fact, our interest is specifically to evaluate the effectiveness of GT and its clinical methodology in the context of Gestalt clinical principles and methods, in order to reveal its particular essence and to assess its effectiveness also as a method standing out from the general field of experiential psychotherapy which it is part of. Moreover, in accordance with Roubal and colleagues  , we believe that it is important to develop a research in GT both in terms of the knowledge and praxis awareness development and the need for it not to be disregarded by the community of scholars and clinicians increasingly oriented towards the scientific evaluation of therapeutic work.
2. Theoretical Background
2.1. Psychotherapy Effectiveness
The studies concerning psychotherapy effectiveness have made much progress, mainly by proving—through rigorous investigations—that this care form can be effective for patients, and that different clinical-theoretical models show similar results  .
In literature, this research topic follows the distinction between studies on outcomes (which evaluate both the overall efficacy and the different forms of efficacy of specific clinical models) and the studies on the process (the mechanisms of change that operate within the therapeutic pathway).
As for the outcome analysis, the research has mainly been directed toward the effectiveness assessment of the specific clinical models. A large number of empirical and evidence-based researches concern the behavioral-cognitivist models. Tolin  proposed a quantitative review concerning the efficacy of Cognitive-Behavioral Therapy (CBT) in comparison with other forms of psychotherapy, showing the superiority of CBT over alternative therapies only among patients with anxiety or depressive disorders. Despite the clear prevalence of empirically-based evidence concerning CBT, the extensive literature also shows the effectiveness of other clinical models. For example, there are the humanistic-experiential therapies that, in Europe, are becoming increasingly widespread, also integrated into approaches not traditionally viewed as humanistic  . Some recent reviews observed the effectiveness of humanistic-experiential therapies   . Among these clinical models, mainly Emotion-Focused Therapy (EFT) got extensive empirical evaluation that has been considered an Evidence-Based Treatment generating a good deal of research on the process of change, even in children and families  . Despite the ever-increasing evidence of their efficacy, humanistic psychotherapies tend to be overlooked in the scientific and health settings  .
While a particular area of research highlights the greater effectiveness of certain clinical models, an equally consistent amount of research emphasizes how different approaches can be equally effective. In their review, Cuijpers, van Straten, Andersson and van Oppen  observed that there are no major differences in efficacy between the major psychotherapies (CBT, Psychodynamic Problem-Solving Therapy, Interpersonal psychotherapy …) for mild to moderate depression.
The assessment of common factors of the various clinical models has been widely developed in research, and their importance in producing the benefits of psychotherapy has been observed  . These commons factors mainly regard process variables—such as empathy, therapeutic alliance, emotion, and interpersonal behaviors—and various studies highlighted how these variables are generally associated with a positive outcome and psychotherapy change     . Rihacek and Roubal  identified three principal components of psychotherapy change: exploration, acceptance, and understanding of patient experience; attending to patients’ own resources; and providing patients with new skills and advice.
Certain scholars showed the transversal interest in process variables spanning across various clinical models. For instance, regarding the emotional process, Whelton  proposed a brief review about it in humanistic, cognitive, behavioral, and psychodynamic psychotherapies, showing the transversal interest in this topic spanning across all therapeutic modalities. In fact, emotional processing and depth of experience are extensively explored both by behaviorists and humanist scholars, who have proven the association with therapeutic outcome and change.
However, as affirmed by Fogarty  , the common factors approach fails to account for the specific elements of what works in therapy and “instead, what is needed is an approach that focuses on a treatment modality’s ‘specific factors’” (pg. 46).
Certain scholars have aimed to identify the essential features of the specific clinical model. For instance, Elliott and Greenberg  identified five essential features of the Process-Experiential/Emotion-Focused Therapy (PE-EFT). It is a neo-humanistic approach that integrates and updates the five features of Person-centered, Gestalt, and existential therapies.
2.2. Concepts, Principles, and Techniques of Gestalt Therapy
The pioneer of GT was Perls  who, basing his approach on Gestalt psychology (Max Wertheimer and Wolfgang Kohler), put the principles of the human as a total entity into practice. GT is part of humanistic-experiential approach (also including Person-centered therapy, Existential therapy, Psychodrama, Emotion-focused Therapy, Experiential therapy, Transactional analysis, process-experiential therapy) that considers the person as a complex self-organizing system, the growth tendency of human functioning, and the human capacity for reflective consciousness.
In GT literature, certain scholars have attempted to identify the principles and specific features of GT with respect to the clinical approach which it is part of  . We proposed a summary of the main features of GT in Table 1.
Thus, the influence of phenomenology and existentialism has been recognized  . Phenomenology is the basis of GT as an experiential psychotherapy  , as well as the “here and now” experience in the clinical process and therapeutic dialogue  .
Albeit GT considers the human being experience lived in the present, it does not neglect the past, which exists in the actual life of people with its unfinished gestalts. As affirmed by Perls  , our life is an infinite number of unfinished situations. Such situations are dysfunctional, and in the clinical process the Gestalt therapist helps the patient satisfy his/her need to complete the uncompleted gestalt emerging from the past.
Moreover, GT values the key concept of Self, which is considered a complex and integrated structure that involves a wide range of aspects, also in opposition to one another  . While the healthy person recognizes his/her Self formed by such different aspects or even opposite aspects, and accepts the possibility to be
Table 1. Summary of the main features of GT.
contradictory, the pathological person views him/herself in a one-sided perspective, focusing rigidly on a polarity of the Self  . Upon creating a polarity, the split in the personality is at the origin of the person’s discomfort inasmuch as not allowing him/herself to live a complete and holistic experience. GT envisages that the Self exists in interaction with others and it is expressed through the process of human contact: a psychological process in which it is possible to meet one’s self, others, and the environment  . GT leads to the recognition of the presence of different contact styles in the individual-environment interactions, some of which functional, creative, or adaptive, and others dysfunctional  .
On the other hand, GT is a functionally oriented clinical model  , focusing on the importance of the person’s adaptation to a changing environment and the various life situations in an unhindered and healthy way, and to create new responses to new situations (creative adjustments). In fact, as affirmed by Perls et al.  the person’s abilities to self-adjust in response to environmental conditions allow his/her growth. This adaptation occurred in terms of figure-ground organization, and while in a healthy patient the figure will emerge clearly from the background and he/she will identify a defined form, in a pathological one the relationship between figure and ground can be inhibited by mental blocks, resulting in an inability to form figures in the here and now.
In the clinical praxis, an important step of GT is the awareness process that does not mean simply developing insight or introspection, but exploring experiences and making sense of our world and our relationship with others and the environment  . In fact, a central tenet of the Gestalt clinical method is experimentation, defined as “a behavioral approach for moving to a new way of operating” (  , pg. 31). It is an experiential learning process, based upon what occurs and emerges during the therapeutic encounter, which also involves the use of different techniques (examples are: making aware of unconscious emotional processes; two-chair/empty chair work; working with unfinished situations from the past). In general, through the various Gestalt techniques—which are nothing more than experiments—the therapist allows the patient to transform the tendency to “talk about” into “talk to”, as Perls  affirmed. Thus, GT recognizes the importance of a direct impact deriving from representing and “acting” the situation in the present, and it favors the dramatized approach to the experience and conflict-based contents more than the traditional conversational approach  .
Moreover, Gestalt therapists believe that in the therapist-patient dialogue the important elements are not only words, but also movements, gestures, tone, and glances, all communicating the relationship between the two. Clemmens  sustained that “embodiment is the sensate experience of my body as self in relation to others and the world about me. I know my arms as I reach my heart as I feel it/[myself] beat together, my eyes as I gaze upon the other. Embodiment is a quality of presence, an ontological sense of ‘here and nowness’, and the sense of being awake and fully engaged in the relational world” (pgs. 3-4).
3.1. Literature Search
The literature search was based on a comprehensive initiative to set up a database of references to clinical studies investigating the effectiveness of GT, published from 2007 to 2018 in English and Italian.
The literature search strategy involved three steps that are summarized in Figure 1:
1) The first step included systematic searches in the ScienceDirect, PubMed, PsycINFO, and Google Scholar databases. Searches were carried out combining keywords and text relating to GT. For the purposes of the present review, all references related to the search terms Gestalt Therapy, Psychotherapy effectiveness, Psychotherapy approaches, and Clinical models were considered for inclusion. In this first step, we have also included essays that could be useful for a full background of the review topic. We have left out proceedings as they entail a time investment for virtually irrelevant material. Overall, we have viewed 1215 paper titles and abstracts.
2) In the second step, based upon the information provided in the title and abstract, all studies found during the database search were assessed for their relevance to our review. We have applied inclusion and exclusion criteria considering also theoretical or clinical studies useful for a full background of the review
Figure 1. Diagram of the work and research process, and screening of the articles.
topic. In particular we included papers focusing on GT and on psychotherapy effectiveness regarding also other clinical models. So, we identified 240 papers. The papers met the inclusion criteria, and a full report of the papers was retrieved.
3) In the third step, we added 55 other papers and a total of 295 full texts were examined by only one author, except when the author sought consultation with colleague to examine their centrality to the review’s aims and their quality, proceeding to their further assessment for selection. Any disagreement has been discussed with an additional review researcher. This approach narrowed down the sample to 52 papers, and information from analysis of these full-texts was used as a basis for the review. Among the discarded papers there are also those with no clear findings related to GT and those that did not present an empirical research. Finally, we focused solely on GT effectiveness and a sample of 11 papers was identified for analysis.
3.2. Data Collection and Analysis
To analyze the final sample of 11 papers, we assessed the theoretical basis – as well as the editorial and scientific quality. In particular, we considered papers published in international journals and empirical researches that respected as much as possible a clear and quality procedure. We have excluded summaries at seminars, reports introduced at conferences, dissertations, and comment arts that provided only partial data and authors’ opinions.
A review design, involving three summary sheets, was employed for a straightforward and immediate knowledge concerning the topics background, research’s goal and hypotheses (sheet one), research methods (samples and their main features, cultural context, research design), clinical interventions, procedure and tools utilized (sheet two), and the main findings of the reviewed papers (sheet three). During this phase of quality appraisal, any question and doubt was resolved through a discussion with a colleague and occasionally by enlisting a third reviewer for mediation.
The review synthesis is narrative, because it aims to provide a full picture of the topics and the methods. The various topics emerging from the sample provided a general understanding of the state-of-the-art concerning the review topic and they are summarized in the following discussion sections.
The majority of the reviewed papers focused on the efficacy of the clinical model in the treatment of psychopathology and various symptoms. However, a number of researches considered different dimensions such as self-development, offender behaviors, social issues, and identity issues. Most papers involved outcomes researches, which assessed GT efficacy especially in group therapy. In certain cases, we found a comparison between GT and other clinical models. Most articles refer to the scarcity of research material concerning GT and the need for evidence-based research in GT.
We have thus considered four result types. One concerns the quality of research method used in the reviewed papers. The other three types concern different research findings of the reviewed papers. We have identified papers that aimed to prove the effectiveness of GT assessment, those that focused on specific GT methods and techniques, and those that proposed a comparison between GT and other clinical models.
4.1. Objectives and Methodological Features of Reviewed Papers
The objectives and methodological features of reviewed papers are resumed in Table 2. In particular, we gathered on research objectives, the sample features and the sampling process, the country in which the research conducted, the research design and procedure, the variables examined and the measured used by the scholars. Then we considered also the therapy method for its importance to observe the different clinical aspects on which the scholars focused. The treatment length also has been examined to assessing the clinical consistent of the treatment proposed.
The majority of researches have been conducted in European (e.g. Serbia, Italy, Spain, Norway), and Extra-European countries (e.g. Mexico, Iran, Australia) and for the most part they used pre-test and post-test research design, which allows to assess the efficacy of clinical treatment or of specific methods and techniques. In some cases, GT was compared with other clinical models. Stevens, Stringfellow, Wakelin and Waring  assessed the effectiveness of GT by comparing it to CBT, Person-Centred Therapy, and Psychodynamic Therapy. Arip, Bakar, Ahmad and Jais  reported the structure and the content validity of a GT group guidance approach for student self-development, testing its content validity and its applicability in any student experiential context.
The research sample varied depending on the goals. Participants of the therapeutic process were mostly patients with different psychopathologies (     . We have also found samples composed of students  and female students with dysthymic disorder  or anxious parents  , but even offenders  , divorced women  , participants in group or workshop GT  and registered psychiatric nurses trained in GT  . In other researches, scholars involved experts  , and psychiatrists  for the assessment of a GT design and method. In certain researches the sample was composed of few participants, following the principle of qualitative research that favors the deepening and richness of data  .
We found poor information concerning sample features and sampling. Generally, scholars reported the participants’ sex and age. In terms of sampling, certain scholars mentioned screening sample criteria such as validated tests  and interviews    .
Furthermore, the scholars used various selection means. The participants have been engaged by means of advertisement in public media  or through organizations and associations   .
Table 2. Synthesis of key objective and methods of reviewed papers.
In terms of the clinical intervention type, researches generally concerned group therapy, sometimes specifying the number of participants, duration, and frequency of the therapy. González-Hidalgo  claimed that the workshops were inspired by Naranjo’s psychotherapist training named SAT (Seekers After Truth). Farahzadi and Masafi  proposed Gestalt Therapy and Cognitive-Behavioural Play Therapy, and González-Ramírez, et al.  used a combination of the Gestalt-Hypnosis Therapy (GHT) and Hypnosis Therapy. Holzinger, et al.  combined GT and GT with lucid dreaming.
Certain scholars mentioned group therapy organization. Generally, groups included 7 - 10 participants   , which were followed for a set period of time and with sessions of about ninety minutes   .
More in particular, the method, used in most proposed clinical interventions, regards different concepts, clinical praxes, and activities referred to GT. The methods we identified are expressive-creative methods, such as drawing  , and spiritual/psychological methods, such as meditation, bodywork and movement, or theatre  . In some cases, particular activities are proposed such as lucid dreaming  , mindful breathing, sensory activity, two-chair work  , even the semi-structural individual narrative interview technique to elicit narrative responses from the participants  .
In terms of the efficacy assessment of the clinical intervention, we found that various different methods and techniques have been used. Certain researches proposed intervention models involving expert advice, such as the group guidance model proposed by Arip, et al.  . González-Hidalgo  spent two months as active participant-observers of GT workshops, and Holzinger, et al.  used video recordings of sessions during the treatment period. Kelly and Howie  employed narrative inquiry, which involves systematic examination of the plots and subplots common to all dreams to identify recurring elements and experiences. Instead, Stevens, et al.  assessed the efficacy of GT with a self-report questionnaire (the Clinical Outcomes in Routine Evaluation/CORE), compiled by clients of gestalt therapists who have joined the research project. It is not specifically Gestalt orientated, but it is the most widely used across psychological therapy services in the UK. It includes 34 items which measured subjective well-being, problems or symptoms, life functioning and risk or harm, and it filled in by the client at the beginning and end of their therapy.
4.2. The Outcomes and Process Effectiveness of GT
The majority of researches aimed to know the outcome effectiveness of GT, especially when it has been applied to group intervention, investigating the important changes that participants reported. The scholars often focused on specific psychopathological, social, and personal issues, as well as on a particular target group. Focusing on the outcomes of GT on indigenous and peasant activists, González-Hidalgo  found that GT workshops (conducted following Naranjo’s SAT-HTH training) helped activists both to reflect on their own life stories and to obtain certain advantages in social life. Following the workshops, a number of participants, especially women, gained confidence to participate more actively in community meetings. Such outcome was considered quite remarkable in a society where women are normally absent at community meetings. Exploring GT training efficacy on professional practice, Kelly and Howie  reported that psychiatrists recognized the potential application of GT knowledge and skills to their psychiatric nursing practice. Organizing a Gestalt group intervention for anxious parents whose children were studying in primary schools, Leung and Khor  found that the clinical approach helped parents to reduce anxiety levels, avoid inner experiences over time, and enhance mindfulness with a slight increase in self-kindness. Focusing on a specific psychological dimension, Saadati and Lashani  observed the effectiveness of GT on the improvement of self-efficacy in divorced women that participated in experimental groups. A research paper by Arip et al.  reported the overall content validity of the group guidance module in student self-development, based on Gestalt theory and its basic principles (such as holistic approach, person experience, individual responsibility, the here and now method). Applying GT group treatment in prison with a sample of offenders with psychopathology symptoms, Doric  found no changes in offenders’ behaviors and lives, although they observed less improvement in depressive groups compared to those suffering of mania, who obtained specific benefits from their active involvement in sessions and from the possibility to resolve basic conflicts in their lives through the analysis of unfinished gestalts.
In a number of papers, the scope of research was to assess the effectiveness of specific Gestalt methods and techniques. Upon undergoing the Gestalt and expressive-creative methods, the geriatric patients analyzed by Drăghici  showed certain improvements in their anxious and depressive symptoms, in their global functionality, and in their interactional behavior. In particular, while during treatment, they became aware of the need to resolve their conflicts, even attempting—at the end of the therapeutic process—to obtain the restoration of their confidence, their communication ability, their feelings of group membership, and the awareness that their need for assistance may be fulfilled by means of supportive and relaxation methods. In a paper by Holzinger, et al.  , the scholars evaluated the efficiency of lucid dreaming in the treatment of recurring nightmares, observing a significant reduction in nightmare frequency (NMF) at the follow-up and end of therapy phases compared with the baseline. A continuous increase in dream recall frequency (DRF) was observed over three weeks, starting from the 5th treatment week onward.
Three research papers reported comparisons between GT and other clinical models. So, Stevens, et al.  assessed the effectiveness of GT by comparing it to national data bases of similar UK studies about other clinical models, such as Cognitive Behavioural Therapy (CBT), Person-Centred Therapy, and Psychodynamic Therapy. They found that Gestalt Therapy was as effective as other modalities. In fact, the scholars observed that the pre-post treatment difference in their research was comparable to the results observed in studies that analyzed other clinical models, using the CORE method of assessment. Farahzadi and Masafi  found the same results upon studying the effectiveness of Gestalt and cognitive-behavioral play therapies to decrease dysthymic disorders and the intensity of symptoms in Iranian children. Instead they observed significant difference in the mean of two clinical models and control group. In particular, the most important feature of both clinical model seems the warm relationship accompanied by confidence-building in the initial sessions. That permitted to children to be able to share their denied feelings (fear, timidity, sadness) and then to express and to talk about these feelings. Focusing on hypnosis, González Ramírez, et al.  compared two treatments about it, Hypnosis therapy and Gestalt-hypnosis therapy. They recognized their effectiveness in patients with forms of depression against a control group. While the therapeutic groups showed significant differences between pre-test and post-test results, with an important decreasing in the depression degree, no difference was observed in the control group.
The aim of this paper was to analyze the state of literature concerning GT effectiveness. In general, we revealed the lack of scientific attention toward GT empirical assessment. In fact, the majority of papers that we found in international literature are essays, where the scholars reported their reflections as well as clinical examples concerning GT and its concepts, methods, and techniques.
Empirical researches using appropriate methods are scarce, so much that we were only able to select 11 papers considered useful for our review. This is both in line with the tendency to be overlooked of humanistic psychotherapies in the scientific and health settings  (Elliott et al., 2013), and in contrast with the extensive empirical evaluation of other clinical models similar to GT such as Emotion-Focused Therapy (EFT)  .
Our reviewed papers involve empirical researches that appear to confirm and strengthen the consideration that GT is an effective and acceptable clinical model. Thus, it was proven that the effectiveness of the clinical model was comparable to other similar clinical approaches, such as humanistic-experiential therapies   .
Moreover, in terms of the implementation of GT in group settings, the papers reported the efficacy of GT and its concepts, methods, and techniques for various issue types, even socio-professional and not only psychopathological. It appears to be an affirmed clinical model that may be applied to numerous social contexts. For instance, González-Hidalgo  conducted an interesting research project focused on indigenous and peasant activists, with the aim of fostering new insights to better understand the subjectivity in political ecology. This appears to be in line with what was claimed by various Gestalt scholars and clinicians who—though sometimes in different ways—have contributed to understand the GT applications not only in clinical contexts, but also in social and health situations. As Menditto  points out, “psychotherapy, which deals not only with the treatment of psychological discomforts, but also with orientation and guidelines for everyday life, encourages the management of insecurity and isolation that come from both our interiority [and] from the complexity of the affective and community context ...” (pgs. 119-120).
In terms of the research method quality of the reviewed papers, we have observed certain trends and limitations that still make it difficult to generalize the findings. The papers reported GT applied to group intervention. No studies concerning other clinical settings—such as individuals, couples, or families—were reported. This was a shortcoming of the review, in that GT has also been applied to such settings, with interesting considerations being made  .
While presenting certain gaps in literature related to the phenomenon, the review of findings allows to support the importance of developing on the subject to generate further knowledge about the effectiveness of the clinical praxis. Such goal is central for GT, because the clinical model suffers a lack of empirical evidence. We believe that GT should reach a greater consideration in the scientific and academic contexts, but to achieve this it is necessary, as affirmed by Boswell, et al.,  “that it should cease its almost exclusive reliance on what has been called “empirical imperialism” (…) where researchers (most of them seeing only a few patients) dictate what to study and how to study it” (pg. 31).
A dialogue between researchers and clinicians is also important. To this regard, Dattilio, Edwards and Fishman  affirmed the need to overcome the divide between researchers and practitioners in the field of psychotherapy. In particular, they stressed the need to overcome the positivist paradigm—which fails to provide for context-based practical knowledge—and to use, instead, a mixed methods paradigm, involving pragmatism and multiplicity.
While our systematic review allows to have a general idea of the state of the art of knowledge and to fill the gaps and critical issues concerning the interesting topic, there are certain considerations to be made. First of all, the selection of keywords and peer-reviewed journals in Italian and English language limited the possibility to analyze additional studies published between 2007 and 2018 consisting mainly of clinical and theoretical essays. We have only considered such studies—in part—in the first section concerning general knowledge about the topic, and indeed they have allowed us to convey a broader picture of the analyzed subject matter. Moreover, our review did not use meta-analysis, which may be more accurate to understand the topic, given that knowledge concerning the subject was relatively scarce. Therefore, the results and conclusions must be interpreted with caution, as it was difficult to present certain inferences on the importance, effects, and ways of solving the issue. Another limitation of our study is that the narrative synthesis is an interpretation by the authors.
In conclusion, despite the above limitations, our review provides a full picture of the art state about GT effectiveness, highlighting some progress in the field of this clinical approach that has suffered from a lack of scientific recognition over the years. As we can see, however, the studies are still scarce and there is still a long way that has been done for being able to fill the gap between research and clinical. About that, our review allows identifying challenges for future research concerning GT.
Firstly, we supported the need to maintain a research line that favors a scientific approach to the topic, in order to facilitate the process of translating the scholars’ opinions, experience, and reflections into research objectives.
Secondly, we affirmed the necessity of a wider range of interesting in-depth GT studies, incorporating different variables identified in GT literature, in order to promote a more accurate and dynamic understanding of its effectiveness. Besides, a more careful rating of the differences in situations, contexts, variables, concepts and techniques, as well as personal, psychopathological, and social characteristics is often forgotten in the reviewed studies, while the latter should subscribe to the tendency toward complex research designs. This is in line with the various studies in psychotherapy effectiveness literature that sustained the importance of focusing on the process, and not only on the outcomes, of psychotherapy.
Also, in GT this approach could be particularly useful in that the model entails many different process variables, some of which similar to other psychotherapeutic approaches such as therapeutic alliance, emotion, and understanding of patient experience attending to patients’ own resources that had formerly been considered variables associated with a positive outcome and psychotherapy change     .
Finally, it is also important to consider the use of both quantitative and qualitative methods, “because these two approaches are essentially different tools that accomplish different things and should be used accordingly” (  , pg. 35).
1In particular the scholars aimed to reduce parents’ anxiety levels, get over avoidance of inner experiences, boost self-kindness, reduce self-judgment, and enhance mindfulness.
 Roubal, J., Francesetti, G., Brownell, P., Melnick, J. and Zeleskov-Djoric, J. (2016) Bridging Practice and Research in Gestalt Therapy. In: Roubal, J., Ed., Towards a Research Tradition in Gestalt Therapy, Cambridge Scholars Publishing, Cambridge, 1-17.
 Elliott, R., Greenberg, L.S. and Lietaer, G. (2004) Research on Experiential Psychotherapies. In: Lambert, M.J., Ed., Bergin and Garfield’s Handbook of Psychotherapy and Behavior Change, 5th Edition, Wiley, New York, 493-539.
 Elliott, R., Watson, J., Greenberg, L.S., Timulak, L. and Freire, E. (2013) Research on Humanistic-Experiential Psychotherapies. In: Lambert, M.J., Ed., Bergin and Garfield’s Handbook of Psychotherapy and Behavior Change, 6th Edition, Wiley, New York, 495-538.
 Vrana, G. and Greenberg, L. (2018) Overview of Emotion-Focused Therapy. In: Foroughe, M., Ed., Emotion Focused Family Therapy with Children and Caregivers: A Trauma-Informed Approach, Routledge, Taylor and Francis Group, New York, 1-22.
 Cuijpers, P., van Straten, A., Andersson, G. and van Oppen,P. (2008) Psychotherapy for Depression in Adults: A Meta-Analysis of Comparative Outcome Studies. Journal of Consulting and Clinical Psychology Copyright, 76, 909-922.
 Herrmann, I.R., Greenberg, L.S. and Auszra, L. (2014) Emotion Categories and Patterns of Change in Experiential Therapy for Depression. Psychotherapy Research, 26, 178-195.
 Malin, A.J. and Pos, A.E. (2014) The Impact of Early Empathy on Alliance Building, Emotional Processing, and Outcome during Experiential Treatment of Depression. Psychotherapy Research, 25, 445-459.
 Wong, K. and Pos, A. (2014) Interpersonal Processes Affecting Early Alliance Formation in Experiential Therapy for Depression. Psychotherapy Research, 24, 1-11.
 Elliott, R. and Greenberg, L.S. (2007) The Essence of Process-Experiential Emotion-Focused Therapy. American Journal of Psychotherapy, 61, 241-254.
 Boris, G.D.J.B., Melo, A.K. and Moreira, V. (2017) Influence of Phenomenology and Existentialism on Gestalt Therapy. Estudos de Psicologia Campinas, 34, 476-486.
 Bloom, D. (2009) The Phenomenological Method of Gestalt Therapy: Revisiting Husserl to Discover the “Essence” of Gestalt Therapy. Gestalt Review, 13, 277-295.
 Arip, M.A.S.M., Bakar, R.B.A., Ahmad, A.B. and Jais, S.Md. (2013) The Development of a Group Guidance Module for Student Self-Development Based on Gestalt Theory. Procedia—Social and Behavioral Sciences, 84, 131.
 González-Ramírez, E., Carrillo-Montoya, T., García-Vega, M.L., Hart, C.E., Zavala-Norzagaray, A.A. and Ley-Quinónez, C.P. (2017) Effectiveness of Hypnosis Therapy and Gestalt Therapy as Depression Treatments. Clínica y Salud, 28, 33-37.
 Farahzadi, M. and Masafi, S. (2013) Effectiveness of Gestalt and Cognitive-Behavioural Play Therapy in decreasing Dythymic Disorder. Procedia—Social and Behavioral Sciences, 84, 1642-1645.
 Leung, G.S.M. and Khor, S.H. (2017) Gestalt Intervention Groups for Anxious Parents in Hong Kong: A Quasi-Experimental Design. Journal of Evidence-Informed Social Work, 14, 183-200.
 Saadati, H. and Lashani, L. (2013) Effectiveness of Gestalt Therapy on Self-Efficacy of Divorced Women Procedia—Social and Behavioral Sciences, 84, 1171-1174.
 Gonzalez-Hidalgo, M. (2017) The Politics of Reflexivity: Subjectivities, Activism, Environmental Conflict and Gestalt Therapy in Southern Chiapas. Emotion, Space and Society, 25, 54-62.
 Kelly, T. and Howie, L. (2011) Exploring the Influence of Gestalt Therapy Training on Psychiatric Nursing Practice: Stories from the Field. International Journal of Mental Health Nursing, 20, 296-304.
 Menditto, M. (2008) Relation, Exploration, Self-Realization in Everyday Life. In: Ferrara, A. and Lobb, M.S., Eds., The Gestalt Voices: Developments and Innovations of a Psychotherapy, Franco Angeli, Milano, 119-153.
 Boswell, J.F., Sharpless, B.A., Greenberg, L.S., Heatherington, L., Huppert, J.D., Barber, J.P., Goldfried, M.R. and Castonguay, L.G. (2010) Schools of Psychotherapy and the Beginnings of a Scientific Approach. In: Barlow, D.H., Ed., The Oxford Handbook of Clinical Psychology, Oxford University Press, Oxford, 98-127.
 Dattilio, F.M., Edwards, D.A.J. and Fishman, D.B. (2010) Case Studies within a Mixed Methods Paradigm: Toward a Resolution of the Alienation between Researcher and Practitioner in Psychotherapy Research. Psychotherapy Theory, Research, Practice, Training, 47, 427-441.