This digest focuses upon what is known about current and impending needs for teachers, data on which this knowledge is based, and what needs to be done to create a solid foundation for projections on future needs. It is pointed out that the data needed to describe the market for teachers vary according to how and by whom the information is used. A description is given of seven users of information on the supply and demand of teachers. Four national agencies that provide the basic information for research in the area of teacher supply and demand are listed. A brief discussion is presented of some professional organizations that are engaged in examining the data requirements for the prediction of teacher demands in their fields of concern. A bibliography is included. (JD)