Past efforts by industrial psychologists, business groups, and others to characterize "job requirements" provide a starting point in developing a SCANS approach to identifying the skills required by work. These past efforts have developed a structure for examining and communicating job requirements. An examination of these past efforts and the viewpoints they represent can help SCANS refine its own viewpoint and focus its efforts. We begin with a brief discussion of general approaches or perspectives on job requirements. This is followed by a compilation of "lists" of skill requirements with brief comments on each of the different organizing frameworks.