The relevance of the DSM-5 Alternative Model for Personality Disorders (AMPD; American Psychiatric Association [APA], 2013) in forensic settings remains largely understudied. In particular, the utility of self-reports on maladaptive traits, as operationalized in the Personality Inventory for DSM-5 (PID-5; Krueger et al., 2012), has not yet been comprehensively examined. To address this gap, the present study collected PID-5 self-reports from individuals admitted to forensic psychiatric services (N = 54) and explored mean-level differences and cross-informant correlations with reports provided by the primary caregiver of the ward. In addition, we investigated the contribution of PID-5 self- and informant-reports for understanding patients’ potential capacity to strive towards Citizenship, Belonging, and Self-management in the context of reorientation towards a less strict regime, as independently evaluated by criminologists. Results showed mean-level agreement for most maladaptive facet-level traits related to Negative Affectivity, Detachment, and Psychoticism. In contrast, notable mean-level differences across informants were found for both the Antagonism and Disinhibition domains, with patients consistently reporting lower scores than informants. Only a few significant facet-level trait correlations were observed across self- and informant-reports, with Psychoticism showing the highest rank-order cross-informant correlations. Finally, both PID-5 self-and informant ratings were significantly related to evaluations of potential adaptation abilities generated by a third independent informant (criminologist), with PID-5 self-reports on internalizing traits and PID-5 informant-reports on externalizing traits uniquely contributing to these estimates. The implications of these findings for forensic clinical assessment and practice are discussed and may further encourage the integration of the PID-5 in forensic assessment.
