The four-day school week is a Monday-Thursday or Tuesday-Friday alternative to the traditional four-day week, which can be implemented with many variables and differing objectives. The four-day week saves heating, transportation, maintenance, electricity and some instructional costs, while providing better educational opportunities and use of facilities. It has proven popular with students, teachers and communities in the 12 Colorado school districts and 20 colleges which have tried it. Only a few minor negative aspects have been reported. (Author/JW)