In a work context, employees tend to gravitate toward situations that are most conducive to meeting their needs. The purpose of this research is threefold. First, we define and specify the psychological needs under investigation, briefly highlight extant research, and differentiate needs from other individual difference variables. Second, we demonstrate the limitations of one of the most highly cited psychological needs instruments and introduce a new needs model. Third, we develop and evaluate a multi-dimensional needs inventory using a multi-study design. The strengths and limitations of the proposed and tested model are discussed, as are implications for future research.