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

Training transfer represents a crucial mechanism for understanding how occupational health psychology training interventions achieve their effects, yet no validated instruments exist to systematically assess the implementation process surrounding transfer within well-being-focused contexts. This study develops and validates the Intervention and Multiphase Training Transfer Assessment Questionnaire, designed specifically to capture contextual elements, transfer mechanisms, and behavioral outcomes across the implementation phases of occupational health psychology training interventions. We tested the Intervention and Multiphase Training Transfer Assessment Questionnaire's psychometric properties, convergent and discriminant validity, and predictive validity using data from a large multinational, multiwave study across 10 organizations (N = 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.