My children never went to montessori but I heard that they work individually on every child and with child's capibilites those children are ahead of children going in public schools.But I heard about it but personally I don't like the system as different age groups are working togehter and there is less social interaction between children which make them self center usually. For example like my daughter was quite shy when she went to school for first time and if I would have put her in montessori then may be her shyness never went.