All versions of the Inventory of Interpersonal Problems (IIP) are broadly used to measure people's interpersonal functioning. The aims of the current study are: (a) to examine the psychometric properties and factor structure of the Italian version of the Inventory of Interpersonal Problems—short version (IIP-32); and (b) to evaluate its associations with core symptoms of different eating disorders. One thousand two hundred and twenty three participants (n = 623 non-clinical and n = 600 clinical participants with eating disorders and obesity) filled out the Inventory of Interpersonal Problems—short version (IIP-32) along with measures of self-esteem (Rosenberg Self-Esteem Scale, RSES), psychological functioning (Outcome Questionnaire, OQ-45), and eating disorders (Eating Disorder Inventory, EDI-3). The present study examined the eight-factor structure of the IIP-32 with Confirmatory Factor Analysis (CFA) and Exploratory Structural Equation Modeling (ESEM). ESEM was also used to test the measurement invariance of the IIP-32 across clinical and non-clinical groups. It was found that CFA had unsatisfactory model fit, whereas the corresponding ESEM solution provided a better fit to the observed data. However, six target factor loadings tend to be modest, and ten items showed cross-loadings higher than 0.30. The configural and metric invariance as well as the scalar and partial strict invariance of the IIP-32 were supported across clinical and non-clinical groups. The internal consistency of the IIP-32 was acceptable and the construct validity was confirmed by significant correlations between IIP-32, RSES, and OQ-45. Furthermore, overall interpersonal difficulties were consistently associated with core eating disorder symptoms, whereas interpersonal styles that reflect the inability to form close relationships, social awkwardness, the inability to be assertive, and a tendency to self-sacrificing were positively associated with general psychological maladjustment. Although further validation of the Italian version of the IIP-32 is needed to support these findings, the results on its cross-cultural validity are promising.

Although recent research has provided empirical support for the codevelopment of group interaction (defined as development in a common direction of perceptions of group relationships), no studies have yet investigated the "causes" of codevelopment among group members in the long term. The aim of the current study is to examine how the perceptions of an individual group member, and other group members, regarding group relationships influence each other over the course of treatment. We analyzed group data from 168 adult obese patients who participated in (1 of 20) 12-session therapy groups for weight management. Group relationships were measured by the Group Questionnaire (Krogel et al., 2013), which was administered to group members in early, middle and late group sessions. The longitudinal version of the group actor-partner interdependence model was used to analyze the influence among members. Results showed that there is no mutual influence in the codevelopment of both positive bonding and negative relationship. However, positive bonding of other group members in the middle of the group influenced positive bonding of the individual group member in the late group session. Moreover, individual group member negative relationships in early and middle sessions influenced other group member negative relationships in middle and late sessions. Finally, there was evidence of mutual influence in the codevelopment of positive working early in the group. The findings show that the process of influence among members is complex with regard to the specific dimension of the group relationship assessed and the time spent in group treatment. Public Significance StatementThis study suggests that there is a mutual influence between the perceptions of the individual group member and the rest of the group regarding group therapy relationships. Additionally, it highlights how an individual group member and other group members codevelop a similar perception of the group relationship. However, the specific type of influence was related to the stage of group development and the specific dimension of group relationships examined.

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The aim of this paper is to reach a thorough understanding of the functioning of the inner world, starting from an elaboration and development of the group-analytic concept of the transpersonal. The study also takes into account the results obtained at the metapsychological level of group-analytic research in England and Italy.