The Difficulties in Emotion Regulation Scale-Dyadic version: A new tool for the evaluation of the dyadic dysregulation in couple relationships.

A new measure for assessing an individual's perception of the dyadic difficulties in emotion regulation with a romantic partner is tested. The Difficulties in Emotion Regulation Scale-Dyadic (DERS-D) was obtained by adapting some items of the previous Difficulties in Emotion Regulation Scale (DERS) to the dyadic context. The scale was administered both to a sample of university students (N = 835) to explore its factorial structure and to a convenience sample (N = 833) together with the DERS, the DERS-Positive, the Emotion Beliefs Questionnaire (EBQ), and the Emotion Regulation Questionnaire (ERQ) to confirm the factorial structure and to explore its construct validity. Results highlight that DERS-D measures two distinct features, namely the lack of dyadic awareness and the lack of dyadic clarity, and that configural invariance across genders was met. DERS-D subscales' internal consistency was high. The correlations between the DERS-D and the other measures demonstrated its construct and criterion validity. The promising nature of these results is discussed in light of the potential clinical and empirical uses of the DERS-D.

Treating intimate partner violence with metacognitive interpersonal therapy: The case of Aaron.

Intimate partner violence (IPV) is responsible for loss of lives and significant psychological, financial, and social costs. Research into therapeutic effectiveness show inconsistent results irrespective of therapeutic orientation. The capacity to understand one's own mental states as subjective and distinct from others is an important factor in the regulation of mental states and physiological arousal associated with the perpetration of IPV. Metacognitive Interpersonal Therapy (MIT) offers an innovative approach in working with male perpetrators of IPV. The current paper outlines 14 sessions of MIT with a 45-year-old male perpetrator. A core aspect was helping the client resolve how his view of self and others were subjective experiences that were distinct from relational objectivity. The emergence of healthy self-narratives was fostered through experiential processes, involving guided imagery, rescripting and body focused interventions. Qualitative outcomes are summarized and implications for the use of MIT in treatment of perpetrators of IPV is discussed.

Alexithymia in Facebook Addiction: Above and Beyond the Role of Pathological Narcissism.

BACKGROUND: Personality dysfunctions and deficits in the capacity to cope with negative emotional states have been related to internet addictions. However, in relation to Facebook addiction, this issue remains poorly investigated. Specifically, few studies explored the role played by grandiose and vulnerable narcissism in Facebook addiction. Furthermore, the relationship between alexithymia and pathological narcissism has not yet been explored in relation to problematic Facebook use. The main objective of this study was to examine the association among Facebook addiction, pathological narcissism and alexithymia. METHOD: A cross sectional study was designed to this aim. A sample of adult participants (N=270; Mage=41.05; SD=14.05) was administered the Bergen Facebook Addiction Scale (BFAS), The Pathological Narcissism Inventory (PNI) and the Toronto Alexithymia Scale (TAS-20). RESULTS: Results showed that pathological narcissism, and especially grandiose narcissism, appears to be an important factor associated to problematic Facebook usage among adults. Moreover, difficulties in the capacity to identify their own emotional states may be a risk factor for such condition. CONCLUSIONS: In conclusion, these results are in line with other data found in the field of behavioral addictions and add further reflection for planning more specific clinical intervention programs for individuals addicted to Facebook with narcissistic traits. These may benefit from a greater focus on the impairments in self-monitoring capacities such as emotional awareness. Personality psychopathologies should be targeted by clinical interventions, but also broader functional impairments (as such as alexithymia) should be addressed as more strategic therapeutic objectives in the field of Facebook Addiction.

Emotion dysregulation acts in the relationship between vulnerable narcissism and suicidal ideation.

Suicide behaviors are peculiar aspects of several cluster B disorders, including Narcissistic Personality Disorder. To date, it is still unclear which facet of narcissism is more related to the desire to die and which other factors are involved in this relationship. This study aims to offer preliminary empirical evidences concerning the relationship between narcissism, emotion dysregulation and suicide ideation. We administered the Pathological Narcissism Inventory (PNI), Difficulties in Emotion Regulation Scale (DERS), PID-5-BF (Personality Inventory for DSM-5-Short Form) and Beck Scale for Suicide ideation (BSI) to a sample of individuals with suicide ideation (n = 70) and a sample of community participants (n = 154). Controlling for age, gender and Negative Affectivity, we found that BSI scores correlated significantly with the vulnerable dimension of narcissism, but not with the grandiose one, and with all DERS dimension, apart from Awareness. Nevertheless, emotion dysregulation moderates the relationship between vulnerable narcissism and suicide ideation. Suicide ideation seems to be deeply connected with the vulnerable dimension of pathological narcissism and the relationship between the constructs is totally mediated by emotion dysregulation. Future directions and clinical implications are discussed.

Improving the psychometric properties of the dissociative experiences scale (DES-II): a Rasch validation study.

BACKGROUND: The Dissociative Experiences Scale-II (DES-II) is a self-report questionnaire that measures dissociative experiences such as derealization, depersonalization, absorption and amnesia. The DES-II has been prevalently used as a screening tool in patients suffering from psychotic disorders or schizophrenia. However, dissociative experiences can also be part of normal psychological life. Despite its popularity, the most problematic aspect of the DES-II is the inconsistency in its factor structure, which is probably due to the tendency to treat ordinal responses as responses on an interval scale, as it is assumed in the Classical Test Theory approach. In order to address issues related to the inconsistency of previous results, the aim of the present study was to collect new psychometric evidence to improve the properties of the DES-II using Rasch analysis, i.e. analyzing the functioning of the response scale. METHODS: Data were obtained on a sample composed by 320 Italian participants (122 inmates and 198 community-dwelling individuals) and were analyzed with the Rasch model. This model allows the estimation of participants' level of dissociation, the degree of misfit of each item, the reliability of each item, and their measurement invariance. Moreover, Rasch estimation allows to determine the best response scale, in terms of response modalities number and their discriminant power. RESULTS: Three items of the scale had strong misfit. After their deletion, the resulting scale was composed by 25 items, which had low levels of misfit and high reliability, and showed measurement invariance. Participants tended to select more often lower categories of the response scale. CONCLUSIONS: Results provided new knowledge on the DES-II structure and its psychometric properties, contributing to the understanding and measurement of the dissociation construct.

Emotion regulation mediates relationships between mindfulness facets and aggression dimensions.

Recent years have witnessed an increase of research on socio-affective factors that can explain individual differences in aggressive tendencies across community and offender populations. Specifically, mindfulness and emotion regulation have emerged as important factors, which could also constitute important prevention and treatment targets. Yet, recent studies have advanced the possibility that mindfulness may also have a "dark" side, being associated with increased levels of aggression-related variables, especially when accounting for the variance associated with emotion regulation. The present study sought to elucidate relationships among mindfulness, emotion regulation, and aggression dimensions (i.e., verbal and physical aggression, anger, and hostility) across violent offender (N = 397) and community (N = 324) samples. Results revealed expected associations between both mindfulness and emotion regulation and aggression dimensions, such that greater impairments in mindfulness and emotion regulation were related to increased levels of aggression across samples. Further, analyses of indirect effects revealed that a latent emotion dysregulation factor accounted for (i.e., mediated) relationships between mindfulness facets and aggression dimensions in both samples. Previously reported positive associations between the residual variance in mindfulness scales (i.e., controlling for emotion regulation) and aggression-related variables were not replicated in the current samples. Taken together, findings suggest that mindfulness and emotion regulation have unequivocal relations with lower levels of aggression, and should therefore be considered as relevant targets for prevention and treatment programs aimed at reducing aggressive tendencies.

Giving a Voice to Gambling Addiction: Analysis of Personal Narratives.

Gambling addiction (GA) is now considered a worldwide health issue. Although the topic of disorder awareness is a central issue in clinical practice, there are few studies examining this dimension in relation to GA. To bridge this gap, we conducted a qualitative study, administering interviews focused on awareness of GA and eliciting narratives of both the disorder and the whole life of participants. We adopted both qualitative and quantitative methods of research, using computer-aided content analysis. We administered to a sample of 15 treatment-seeking gamblers the Psychiatric Interview for Gambling Addiction and performed a qualitative analysis of the text using the T-Lab software. Five main thematic domains and four factors emerged, shedding light on specific aspects underlying the development of and recovery from GA. Specifically, the results suggested that dissociation processes, materialistic thinking and difficulties in social achievement underlie the subjective experience of GA. Moreover, closeness in interpersonal relationships and awareness of the disorder emerged as core features in the process of change. As a whole, the results highlight the specificities of disorder awareness in addicted gamblers. We discuss these results within the context of previous research and suggest clinical implications for the treatment of GA.

Pathological personality facets and emotion (dys)regulation in gambling disorder.

A number of researches showed high prevalence of personality disorders among addicted gamblers. However, there are still few studies investigating the role of pathological personality facets in Gambling Disorder (GD). Moreover, the nature of the relationship between GD and pathological personality is not clear. We administered to a group of addicted gamblers (N = 79) and a group of healthy participants (N = 101) a battery of self-report questionnaires encompassing the South Oaks Gambling Screen (SOGS), The Personality Inventory for DSM-V (PID-5), the Difficulties in Emotion Regulation Scale (DERS) and the Emotion Regulation Questionnaire (ERQ). Analyses of variance showed that addicted gamblers, compared to healthy participants, scored higher on most of the subscales of the DERS, on the Suppression Dimension of the ERQ and on the five main domains of the PID-5 whereas they obtained lower scores on the Reappraisal subscale of the ERQ. Moreover, multiple regression analyses indicated that some specific facets of pathological personality, emotion dysregulation and lack of cognitive reappraisal, significantly predict GD's severity. Finally, emotion dysregulation levels and lack of cognitive reappraisal partially mediated the relationship between these and GD's severity. Our results confirmed the central roles played by both pathological personality and deficit in emotion regulation capacities in GD. Specifically, Impulsivity, Lack of Perseverance and Suspiciousness may be important predictors of GD severity. Moreover, emotion dysregulation and lack of adaptive emotion regulation strategies partially explained such relationship. As such, training for emotion regulation abilities appears strategically useful in the treatment of addicted gamblers with pathological personality traits.

Metacognitive Interpersonal Mindfulness-Based Training for Worry About Interpersonal Events: A Pilot Feasibility and Acceptability Study.

Individuals with personality disorders experience worry and repetitive thoughts regarding interpersonal scenarios. Mainstream mindfulness-based approaches may be insufficient to soothe these individual's distress due to difficulties in letting thoughts go and refocusing attention to the present moment. For this reason, we devised an adapted form of mindfulness-based program called Metacognitive Interpersonal Mindfulness-Based Training (MIMBT) for personality disorders. In this pilot study, 28 individuals attended nine weekly sessions to evaluate the feasibility and acceptability, and to establish preliminary outcomes. All individuals completed the program. Attendance was very high (96%). Significant changes were observed on the primary outcome of reduction in repetitive thinking, measured using the Metacognition Questionnaire-30. We also observed a decrease in depression severity. Despite important limitations, this pilot study suggests that MIMBT has the potential to be a viable and well-accepted option for increasing positive outcomes in the treatment of personality disorders. Clinical considerations and directions for future research are discussed.

Struggling with Happiness: A Pathway Leading Depression to Gambling Disorder.

A number of studies have suggested that depressive mood might lead to the development and/or maintenance of a gambling disorder (GD). The pathways by which such relationships are fostered may involve deficits in emotional regulation capacity and dysfunctional coping styles. This study aims to explore the role played by depressive symptomatology and the regulation of positive emotion in GD. We administered the South Oaks Gambling Inventory (SOGS, Lesieur and Blume in Am J Psychiatry 144(9):1184-1188, 1987), the 21-item Depression Anxiety Stress Scale (DASS-21, Lovibond and Lovibond in Manual for the depression anxiety stress scales. Psychology Foundation, Sydney, 1995) and the Kill-joy Thinking subscale of the Ways of Savouring Checklist (WOSC, Bryant and Veroff in Savoring: a new model of positive experience. Lawrence Erlbaum, Mahwah, 2007) to a sample of pathological gamblers (n = 91) and a sample of community participants (n = 105). The pathological gamblers scored higher on the DASS-21 subscales and obtained higher scores on the Kill-joy Thinking subscale of the WOSC compared to the controls. Moreover, the SOGS scores positively correlate with the DASS-21 subscales, and with the Kill-Joy Thinking measure. Finally, it is evident that Kill-joy Thinking fully mediates the relationship between depressive symptomatology and GD severity. Our results further confirm the roles of depression, anxiety and stress in GD. Moreover, this is the first study to explore the mediating role of dampening processes in the relationship between depression and GD. Future lines of research are also discussed.

Narcissistic Implications in Gambling Disorder: The Mediating Role of Emotion Dysregulation.

Gambling Disorder (GD) is a complex psychopathology involving a numbers of cognitive, behavioral, emotional and neurobiological determinants. Previous research suggests that GD may frequently co-occur with Narcissistic Personality Disorder. However, there is still a lack of study investigating Pathological Narcissism (PN) in both its vulnerable and grandiose facets among clinical population. Moreover, emotional dysregulation is commonly thought to underlie GD albeit research on this topic remains poor. The present study aims to investigate the role of both vulnerable and grandiose narcissism in relation to GD as well as the mediator role played by emotion dysregulation in such link. We administered to a sample of addicted gamblers (n = 74) and a sample of heathy controls (n = 105), the South Oaks Gambling Screen (SOGS), the Pathological Narcissism Inventory (PNI) and the Difficulties in Emotion Regulation Scale (DERS). Differences across groups emerged on the scores obtained on the PNI and DERS. Moreover, we found positive associations between SOGS scores and both PNI and DERS. Also, strategic addicted gamblers showed higher levels of vulnerable narcissism compared to others. Finally, emotion dysregulation difficulties appeared to fully mediate the relationship between grandiose narcissism and GD severity. Grandiose and vulnerable narcissism appear important variables involved in GD. Also, emotion regulation deficits seem to account for GD and to explain the pathways by which grandiose narcissism leads to GD. Clinical implications and future directions are discussed.

Inappropriate Sexual Behaviors Among Community-Dwelling Patients with Dementia.

OBJECTIVE: Inappropriate sexual behaviors (ISBs) represent challenging and stressful manifestations of dementia and are highly burdening for patients, families, and healthcare providers. Nevertheless, ISBs have so far attracted limited clinical and scientific interest compared with other neuropsychiatric symptoms occurring in dementing illnesses. The authors aimed to systematically investigate the prevalence and characteristics of ISBs in a population of patients with dementia attending a memory clinic. METHODS: In this cross-sectional study, individuals with dementia attending our memory clinic were consecutively enrolled between January 2015 and February 2016. Participating subjects underwent a detailed medical history collection and a comprehensive cognitive, functional, and neuropsychiatric assessment. The presence of ISBs (in the previous 30 days) was investigated by the adoption of an ad hoc questionnaire, administered to informants. A logistic regression model was carried out to identify sociodemographic and clinical variables associated with ISBs. RESULTS: In the 195 patients (48.7% women) with dementia recruited for the study, ISBs were detected in 35 patients (17.9% of the total sample). The logistic regression model showed that male sex (OR: 5.14; 95% CI: 1.44-18.41) and anxiety (OR: 4.92; 95% CI: 1.44-16.84) were statistically significantly associated with the presence of ISBs. CONCLUSION: ISBs represent common manifestations of dementing illnesses. Given the significant burden of ISBs on patients and families and the impact on care management, their occurrence should always be investigated in the clinical care of individuals with dementia. For this purpose, specific screening/assessment tools should be properly designed and validated.

Unique Associations Among Emotion Dysregulation Dimensions and Aggressive Tendencies: A Multisite Study.

Although problems with emotion regulation (ER) have long been associated with internalizing symptoms, only recently has an ER framework been applied to the study of aggression. Therefore, little is known about the unique and independent associations between specific domains of the ER construct and different kinds of aggressive tendencies. We sought to explore these associations in two independent samples of young adults. Furthermore, we tested whether gender moderated the proposed emotion dysregulation-aggression link. Our results corroborated the association between emotion dysregulation and aggression in both samples. Specifically, the inability to control impulsive behavior when upset (i.e., negative urgency) was uniquely related to physical aggression, verbal aggression, anger, and hostility. Limited access to ER strategies was also significantly associated with overall aggression and hostility. The effect of negative urgency on physical and verbal aggression was stronger among males than females, although only in one sample.

Exploring Anger Among Offenders: The Role of Emotion Dysregulation and Alexithymia.

This study tests whether specific dimensions of emotion dysregulation predict maladaptive anger expression among offenders from Italy and Australia. In particular, it examines the unique associations among emotion dysregulation dimensions and different aspects of anger expression and control, in both inmates and offenders on parole. Multiple regression analyses reveal that difficulties controlling impulsive behaviour when distressed are related to state anger, trait anger, and chronic anger expression. On the other hand, alexithymia predicts the maladaptive expression of anger inwardly directed. Finally, lack of emotional awareness and limited access to emotion regulation (ER) strategies are negatively related to anger control, suggesting that they may represent useful treatment targets. Interestingly, incarcerated offenders reported significantly higher levels of state anger and lower levels of anger control out (i.e. seeking support from others) than offenders living on parole in the community, highlighting the importance of contextual influences in the emotional life of offenders.

Mindfulness moderates the relationship between aggression and Antisocial Personality Disorder traits: Preliminary investigation with an offender sample.

INTRODUCTION: Poor mentalizing has been described as a characteristic of Antisocial Personality Disorder (ASPD), along with the well-established role of aggressiveness. In the current study, we tested this hypothesis focusing on a specific aspect of mentalization (i.e., mindfulness). METHOD: We explored the unique and joint contribution of aggression dimensions and mindfulness facets to ASPD traits in an offender sample (N=83). RESULTS: Mindfulness deficits were associated with ASPD traits, and a significant unique association emerged between difficulties in acting with awareness and ASPD traits. Likewise, physical aggression confirmed its association with ASPD traits. Moderation analyses revealed that mindfulness interacted with aggression in predicting ASPD. Specifically, at low levels of mindfulness, the association between aggression and ASPD dropped to nonsignificance. CONCLUSIONS: Results suggest that fostering self-mentalizing is a relevant treatment target when treating offenders with ASPD.

Understanding the connection between self-esteem and aggression: The mediating role of emotion dysregulation.

The purpose of the present study was to extend previous knowledge concerning the link between self-esteem and aggression by examining the mediating role of emotion dysregulation among offenders and community participants. A sample of 153 incarcerated violent offenders and a community sample of 197 individuals completed self-report measures of self-esteem level, emotion dysregulation, and trait aggression. Offenders reported lower levels of self-esteem than community participants, as well as greater levels of emotional nonacceptance and hostility. Bootstrapping analyses were performed to test whether emotion dysregulation mediated the association between self-esteem level and aggression. In the offender sample, mediation models were significant for three of the four aspects of trait aggression that were considered. Emotion dysregulation fully mediated the links that low self-esteem had with physical aggression, anger, and hostility. The same pattern (with the addition of full mediation for verbal aggression) was confirmed in the community sample. Our findings suggest that emotion dysregulation may play an important role in the connection between low self-esteem and aggression. Alternative models of the associations among these variables were tested and discussed. As a whole, the present results are consistent with those of other studies and suggest that it may be beneficial to include emotion regulation modules as part of prevention and treatment programs for violent offenders.

Emotion Dysregulation Mediates the Relation between Mindfulness and Rejection Sensitivity.

BACKGROUND: The role of rejection sensitivity (RS; the tendency to anxiously expect, readily perceive, and overreact to implied or overt interpersonal rejection) in psychopathology has mainly been studied with regard to borderline personality disorder (BPD). In the present study, we first sought to extend previous evidence of heightened RS in a clinical group with psychiatric disorders other than BPD, when compared with a community sample. Then, we tested whether emotion dysregulation and mindfulness were associated with RS in both sample, further hypothesizing that emotion dysregulation would mediate the relation between mindfulness deficits and RS. SUBJECTS AND METHODS: We adopted a cross-sectional design involving 191 psychiatric patients and 277 community participants (total N=468). All participants completed the Rejection Sensitivity Questionnaire, the Five Facet Mindfulness Questionnaire, and the Difficulties in Emotion Regulation Scale. RESULTS: Our hypotheses were supported, with psychiatric patients reporting greater levels of rejection sensitivity and emotion dysregulation, and lower level of mindfulness. Mindfulness deficits and emotion dysregulation explained a significant amount of variance in RS, in both samples. Finally, bootstrap analyses revealed that mindfulness deficits played an indirect effect on RS through the mediating role of emotion dysregulation. In particular, two different patterns emerged. Among psychiatric patients, an impairment in the ability to assume a non-judgmental stance towards own thoughts and feelings was related to RS through the mediation of limited access to emotion regulation strategies. Conversely, in the community sample, overall emotion dysregulation mediated the effect of lack of attention and awareness for present activities and experience on RS. CONCLUSIONS: Longitudinal studies could help in delineating etiological models of RS, and the joint role of deficits in mindfulness and emotion regulation should inform treatment programs.

Exploring Narcissism in Suicidal Ideation Using the Italian Version of the Guilt and Shame Proneness Scale.

Objective: Several theoretical and clinical observations lead to the hypothesis that pathological narcissism could be associated with suicide ideation due to the difficulty in regulating shame in a functional way. The present study investigated the roles of guilt, shame and rivalry in the relationship between pathological narcissism and suicidal ideation. Methods: A set of self-report questionnaires was completed by a sample of 936 Italian adults. These included the Italian version of the Guilt and Shame Proneness (GASP) scale, the Pathological Narcissism Inventory, the Beck Scale for Suicidal Ideation, and the Narcissism Admiration and Rivalry Questionnaire. Results: A structural equation model that tested the factorial structure of the GASP and its invariance produced satisfactory results. Moreover, shame was a significant factor in the relationship between narcissism grandiosity and suicidal ideation. However, beta regression coefficients were low. Conclusion: These findings suggest that despite clinicians should consider the presence of suicidal ideation in patients with pathological narcissism and their maladaptive regulation of shame, the relationship between these variables is complex and deserve further investigation.

The multifaceted role of emotion regulation in suicidality: Systematic reviews and meta-analytic evidence.

Despite the number of empirical contributions on the topic, scientists have offered contrasting perspectives on the role of adaptive versus maladaptive emotion regulation (ER) strategies in suicidality. Moreover, suicidal attempts and suicidal ideation are likely to be differentially related to single ER strategies. To provide more systematic knowledge that can be used to draw sound conclusions and formulate clinical indications, we carried out a systematic review and meta-analysis that we reported in compliance with Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) standards (Moher et al., 2009). From an initial pool of 16,530 articles retrieved from scientific databases (APA PsycInfo, APA PsycArticles, Medline, Scopus, Web of Science, and PubMed) and a search for gray literature, 226 articles were selected to perform 15 meta-analyses. In addition, metaregressions were carried out to test a series of moderators, including the type of suicidality investigated. Among adaptive strategies, results evidenced the role of reappraisal, mindfulness, and several aspects of problem solving. In contrast to our hypothesis, reflective attitude was positively associated with suicidality, calling into question the traditional distinction between adaptive and maladaptive strategies. Regarding maladaptive ER strategies, suppression, avoidance, rumination, brooding, negative problem orientation, and both impulsive and avoidant problem solving proved to be significantly associated with suicidality. Finally, several moderation effects involving age, gender composition, and type of suicidality were observed, supporting the importance of adopting a complex perspective when approaching the topic. Despite the interesting preliminary results, additional research is needed to provide a greater understanding of the interplay between the different ER strategies and suicidality and to develop effective protocols of intervention. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

The Relation of Anxiety and Avoidance Dimensions of Attachment to Intimate Partner Violence: A Meta-Analysis About Victims.

Objective: Attachment theory is a useful framework for understanding the phenomenon of intimate partner violence (IPV) victimisation. Many studies have examined the relationship between attachment and IPV victimisation. The need to examine the nature of this relationship through a meta-analytic approach arises from an awareness of the amount of contrasting data surrounding the topic. Method: Searching five databases (PsycINFO, PsycARTICLES, MEDLINE, Scopus, Web of Science and PubMed) and screening 4343 records, resulted in 34 studies comprising 1271 individuals who met the inclusion criteria for this meta-analysis. Results: Results about attachment anxiety showed significant and moderate effect sizes (ranging from .18 for generic violence to .25 for sexual violence). Results about attachment avoidance also showed significant and moderate effect sizes (ranging from .18 for physical violence to .30 for generic violence). Conclusions: The meta-analysis findings highlight that the relationship between the dimensions of anxiety and the avoidance of attachment are significantly related to all forms of IPV victimisation, with moderate and moderate-to-strong effect sizes, respectively. These results are significant in that they confirm the importance of the relationship between attachment and IPV victimisation, suggesting promising new directions in which this field can further develop.