Research on the process of training evaluation has progressed in many independent fields. In our study,we combine the unique views on training, and training evaluation from the fields of psychology,education, economics, and econometrics. Psychology and education provide knowledge on how toconduct training, and they emphasize important individual and environmental factors that may facilitatethe transfer of skills and prevent skill decay. However, empirical methods offer a sound way of not onlytesting the underlying theoretical hypotheses, such as Human Capital theory in economics orpsychological cognitive theories, but also quantifying individual and operational performance effects.With this multidisciplinary approach, we are able to rethink existing views on the underlying learningmechanisms and generate new insights into this complex and multifaceted economic subject of returnsto training.