Purpose: This study aims to explore the simultaneous impact of employees participation in non-technical training, technical training, and coaching on subsequent job performance, job involvement, and job satisfaction. Design/methodology/approach: The present study was based on a sample of German call center employees and on a longitudinal, multiple-sources-of-data research design. Findings: It was found that non-technical training impacted subsequent soft skills and that technical training predicted subsequent hard skills as well as job involvement. Moreover, employees participation in coaching predicted job satisfaction. Research limitations/implications: The present study was the first to demonstrate positive effects of technical training on job involvement, and of coaching on job satisfaction. In sum, validity of several developmental interventions was highlighted. Practical implications: Organizations designing and implementing various developmental interventions should pay attention to the relative effectiveness of these interventions on various organizational-relevant outcome criteria. Originality/value: For the first time, the simultaneous impact of multiple human resource development interventions on several outcome criteria was tested empirically. (Contains 2 tables.)