“…Valentine and Whitaker (1997) describe flexible interdisciplinary block scheduling as "A trademark of middle level education," (p. 280) despite the absence of available statistics on its current use. Similar positive effects of implementing flexible block scheduling were reported at the middle school level as were reported at high schools (DeRouen, 1998;Gallagher, 1999;Smith, Pitkin, & Rettig, 1998). The middle schools these researchers studied used a more flexible schedule than the 4 x 4 semester block model that utilizes consistent 80 to 90 minute periods taught in a single subject instructional approach (i.e., no interdisciplinary studies).…”