We know that all children mature at different rates and that all children have different triggers to learning. The idea that all five year olds, born in the fall of a particular year are ready to start school at the same time, learn to read at the same time, learn to print at the same time, and so forth, runs contrary to what we know about human development and cognition. Students should be able to start when they are ready to start school and not before. Students that are able to advance ought to be able to do so and those that need longer, allowed to linger. Older students can expand their horizons with younger students working on problems of mutual interest. Schools now are organized according to an industrial model that no longer works.