They aren't really "partnered up" or at least not in DS's montessori school. But they are in mixed age classrooms--so 3-5 year olds, 6-8 year olds, etc. My son has autism and is behind socially and was pretty far behind in conversational skills/social communication (although his vocabulary has been quite good. He still is behind in appropriately using it--he has a huge vocabulary and has tested into the gifted category for language but has difficulty communicating thoughts to other people in a way that the other person can understand them...it's like he knows the words, he knows how to say them, but it gets lost when he tries to say them to other people in a conversational sense.)
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That being said, he has done very well in Montessori. In the early years, they don't need to come in with a huge vocabulary or a lot of communication skills, especially at 3 years old. It will come... For DS, the mixed ages were a blessing because cognitively, he worked a couple years ahead, but socially he was always at the lower end of the range, so there was always someone "at his level", as well as always someone above his level that could pull him up a bit. He is very well accepted at school (although for some reason, there seems to be a pretty high percentage of "quirky" kids at his school....there are only 3 autistic children in the school, but there are quite a few that come in with sensory difficulties or IEPs of some sort, and then there are others who are just quirky by nature), so he doesn't reIally "stick out" so to speak. I think the mixed age groups help because if you're behind, you don't stick out as being behind, because there are kids at the younger and of the age range who are at a similar level.Â
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I think you'll find at 2 1/2-3, most of the children won't be too chatty at school, especially in the beginning. And the emphasis that the montessori method puts on language development might be very beneficial to him.