Neither is it whole class instruction in the grade level books. We are very concerned with providing instructional level reading for all children but we make our instruction multilevel in a variety of ways in each block. We do not believe that Guided Reading is the only way to teach children to read. We teach children who struggle with Guided Reading but who become wonderful readers because of the instruction the teacher provides them during Writing, Self Selected Reading and Words. Once teachers decide on a schedule that works best for them, they usually do the same blocks at the same times each day but we could show you any order you wanted to see.
Teachers have a variety of reasons for scheduling certain blocks when they do.
In some classrooms, a special teacher, assistant or other helper comes for part of the day. Many teachers feel that Guided Reading or Writing are the two blocks that benefit most from having an extra adult in the classroom and thus schedule one or both of these when they have help coming. We would like for children who leave for any special instruction to not miss one of the blocks unless we are absolutely certain that child is receiving instruction in that approach while out of the classroom. If a child goes to Reading Recovery, for example, we know that child is getting the very best guided reading instruction, so we might schedule our classroom Guided Reading Block during that time. Another possibility is for the Reading Recovery teacher to alternate when children are taken so that children do not miss the same block every day.