Design and validation of the Intervention and Multiphase Training Transfer Assessment Questionnaire (IMTTAQ) for individual, group, and leader occupational health psychology training interventions.

= 1,966 at T1) in five European countries, with data collected over six time points. Results demonstrated (a) strong psychometric properties, including robust factor structure and temporal reliability, (b) convergent and discriminant validity with expected relationships between subscales, and (c) predictive validity showing that pretraining contextual constructs and training experiences predicted posttraining integration and well-being outcomes. The Intervention and Multiphase Training Transfer Assessment Questionnaire provides a validated tool for systematically assessing training transfer across temporal phases (pretraining, during training, and posttraining integration), enabling researchers and practitioners to evaluate the contextual constructs and mechanisms that facilitate successful workplace learning integration in occupational health psychology interventions. (PsycInfo Database Record (c) 2026 APA, all rights reserved).