A system of individually guided education (IGE), composed of seven motivation components designed to produce environments where individually guided educational practices can be introduced, has been developed to bring about major modifications in current elementary school educational practices. The organizational-administrative component -- the multiunit elementary school (MUS-E) -- is one of the more recently inaugurated components. The MUS-E emerged after 1965 from a synthesis of theory and practice regarding instructional programing for the individual student, horizontal and vertical organization for instruction, role differentiation, shared decisionmaking, and open communication. This report describes (1) the larger IGE system and where MUS-E fits into it, (2) the MUS-E and its developments and evaluations, (3) the development-evaluation procedures, and (4) the results of the MUS-E development and evaluation procedures. Related documents are EA 003 476 and EA 003 577. (Author/MLF)