Practical issues surrounding the development and use of the instrument known as the "in-basket" test or exercise are discussed. The test or technique is a versatile instrument that has many as yet unexplored possibilities. More research is needed to determine the nature of skills being measured in a testing situation. Little longitudinal or retest data exist and little is known as to the effect of administrative experience on performance. It has been suggested that more attention should be given to developing a theoretical framework. In-basket instruments could then be developed and described precisely on the basis of the model. A bibliography is appended that includes most of the significant studies on in-basket research.