Education for the Developmentally Young (EDY) is a structured teaching approach involving strategies such as task analysis, chaining tasks and discrete trials to train children through a gradient of prompts until they can master tasks independently.
The EDY approach also focuses on classroom organisation and planning to optimise the use of adults within a classroom.
Read this article on room management. While the terminology is dated, the principles of classroom management remain valid.
McBrien and Weightman: The effect of room management procedures on the engagement of profoundly retarded children
Farrell, P., McBrien, J. and Foxen, T. (1992) EDY instructor's handbook: Teaching People with severe Learning Difficulties. Manchester University Press.