The needs assessment process, as a tool for decision making, continues to enjoy high visibility in the professional literature, especially in the area of training and human resource development. This literature review explores needs assessment in selected disciplines and provides generalizations about its application. Five needs assessment variables guided our survey of the purposes and methods of the needs assessments described in 106 articles in five general areas (applied sciences, education/technology, medicine/allied health, business/information sciences, and human/public services).