Measurement-based care (MBC) is widely recommended in psychiatry but remains underutilized in routine clinical settings. The Transdiagnostic Global Impression – Psychopathology (TGI-P) scale was developed to provide a brief yet comprehensive assessment of 10 core transdiagnostic symptom domains. To support more inclusive care and promote patient and caregiver engagement in treatment planning, two new versions of the TGI-P, that is, a patient-rated and a separate informant-rated, were developed, complementing the previously published clinician-rated version.

The patient and informant versions mirror the original clinician-rated TGI-P, assessing the identical 10 domains using a seven-point Likert severity scale, with results displayed via a personalized symptom map. A user satisfaction/feasibility study was conducted with 50 participants (25 patients and 25 caregivers) from the UK and US. After completing the scale, participants provided feedback on its clarity, usability, emotional impact, and comparative utility.

Most participants completed the scale in less than 5 min. Instructions were considered clear, and the format was rated easy to follow. Response options were deemed appropriate by 86% of participants, and the visual output was widely appreciated. While one-third reported mild emotional triggering, overall burden was described as manageable. Approximately, three-quarters of participants rated the TGI-P as equal to or better than other tools they had used.

TGI-P patient and informant versions were developed and, informed by the feasibility study, refined to offer brief, user-friendly tools that support multi-informant assessment as input to MBC. Both versions of the TGI-P, with their graphical output, may support shared understanding and collaborative decision making among clinicians, patients, and caregivers. A validation study of the TGI-P is underway.