Our aim is to provide a complete review of the data collected so far with the Interpersonal Guilt Rating Scale-15 self-report (IGRS-15 s; Gazzillo et al., 2018), a 15-item clinician tool aimed at the assessment of interpersonal guilt according to Control-Mastery Theory (CMT; Gazzillo, 2016; Weiss, 1993). A CFA conducted on a sample of 645 subject found a three-factor solution: Survivor guilt, Omnipotence guilt (comprising the items assessing Omnipotent responsibility guilt and Separation/disloyalty guilt) and Self-hate. The re-test reliability assessed on a random subsample of 54 subjects was good (r from .70 to.76). To assess its concurrent and discriminant validity, we calculated the correlations between IGRS-15s and the Scale for the Measurement of the Impending Punishment (SMIP; Caprara et al., 1990) (r from .31 to .37), and the Interpersonal Guilt Questionnaire-67 (IGQ-67; O’Connor et al., 1997) (r from .34 to .88). To test its construct validity, we assessed the relationships with the Affective Neuroscience Personality Scales (ANPS; Davis et al., 2003) (r from -.14 to .28, all consistent with our theoretical predictions), and the Psychological General Well-Being Index (PGWBI; Dupuy, 1984), (r from -.19 to -.29). Finally, in a sample of 448 subjects, we found positive correlations between guilt and shame (r from .31 to .60) assessed with the Other As Shamer (OAS; Gross et al., 1994); no correlation between guilt and social desirability, assessed with the Marlow and Crow-Social Desirability Scale (MC-SDS; Italian brief form by Manganelli et al., 2000), negative correlations between guilt and self-esteem (r from -.29 to -.53), assessed with the Rosenberg Self-esteem Scale (RSE; Rosemberg, 1965); differences between people who report traumas in their early childhood and people who don’t; and negative correlations between guilt and therapeutic alliance assessed with the Working Alliance Inventory (WAI; Horvath, 1991) (r from -.17 to -.30)