Determining the information needs of management has been an important area of MIS research. Yet most existing techniques focus only on user perceived importance of information. The notion of Information Deficiency integrates both user perceived importance and user perceived availability of an information category. This paper proposes that Information Deficiency is a more important indicator of how crucial a category is to the system designer in relation to other categories. A laboratory experiment that was used to test this notion is described and implications for systems design are discussed.