I'd also add that what a term means in reality vs what it means to the people who are using it and instructing based on it can be two very different things smile I'd ask the person (or team) who wrote the IEP to define exactly what "cluster grouping" means to them - and then get very specific about writing it out in the IEP. If it's something that you think is a *good* practice for your child and it's not clearly defined, then I'd suggest you write out your understanding of it in the parent comments section of the IEP. If it's something you're concerned about, address it.

Best wishes,

polarbear