Why do a trimester schedule? With the advent of block scheduling, many high schools conducted research on utilizing that plan in a trimester format. There appeared to be three issues that most schools faced: (1) How to provide substantive instructional time that was not fragmented?; (2) How does the school climate contribute positively to students' learning?; and (3) How to provide the appropriate amount of instructional time so that each student can learn in the best ways for him/her? "Breaking Ranks" suggested that: (1) curriculum should offer essential knowledge that makes connections to real life; (2) instructional strategies should actively engage students in their learning; (3) the environment should be receptive to the learners and educators; (4) time and space be reexamined and utilized to best meet the needs of the students; and (5) all stakeholders should be accountable for assessment of the instructional program. (Contains 11 online resources.)