Based upon data from the preceding year, the teachers form reading groups, hand out the basals, and jump right into reading instruction. There are several disadvantages, however, in initiating a reading program in this manner. First, records indicating prior placements may not be accurate predictors of current placements: past reading group assignments themselves may have been inaccurate, and/or children may have regressed ( or possibly progressed) in reading ability over the summer. Second, teachers need time to get to know each individual child and his/her reading strengths and weaknesses before determining an instructional level and assigning him/her to a reading group. And third, students need time to readjust to school and "warm up" their reading skills before they can be expected to perform effectively in a rigorous, developmental reading program.
Baumann, J. F. (1982). Getting Started in the Fall: Organized Reading Instruction. Reading Horizons: A Journal of Literacy and Language Arts, 22 (4). Retrieved from https://scholarworks.wmich.edu/reading_horizons/vol22/iss4/2