This report contains a summary and synthesis of all the information and recommendations contained in six different studies, conducted during 1969-70 in eight Michigan school districts, as to the feasibility of extending the regular school year. Three school districts--Port Huron, Northville, and Utica--selected the four-quarter mandated design for their K-12 studies. Under this plan, students are divided into four groups and assigned by family units to attend three of four quarters on a staggered basis. The Freeland school district selected the mandated trimester design which calls for the division of a lengthened school year into three 78-day trimester segments. Students attend school seven hours a day for two trimesters. The Ann Arbor school district selected a modified split-trimester design in which students attend five of six 36-day blocks in a year. The Okemos, East Lansing, and Haslett school districts selected the five term or continuous school year design for their cooperative secondary study. Under this plan, students may attend four or five 9-week terms a year. The report describes the nature of the communities involved, how the communities were informed of each plan, community attitudes and vacation preferences, and the implications of the extended school year for school finance. (Page 21 may reproduce poorly.) (Author/DN)