Psychometrically sound evaluation measures are vital for examining the contribution of professional training to organizational success in a reliable manner. As training evaluations tend to be both time-consuming and labor-intensive, there is an increasing demand for economic evaluation inventories. Simultaneously, evaluation measures have to meet psychometric standards. The present paper develops a time-efficient training evaluation questionnaire that (1) has psychometrically sound properties; (2) measures more than the participants' reactions; and (3) is widely applicable across different training contents, thus allowing for comparisons of training programs within and between organizations. The Questionnaire for Professional Training Evaluation is primarily developed for use in practice but is also applicable to field research and covers short-term as well as long-term training outcomes. Analyses based on a total of n = 1134 employees show the stability of the factor structure and hint at the questionnaire's differential and discriminant validity. Theoretical and practical implications are discussed. (Contains 5 tables and 3 figures.)