I guess in Montessori every single student isn't learning something different, but each one is often in a unique state of learning and development. The guide gives lessons in small groups, less than 6. Each kid gets a new lesson every few days and spends the remainder of their time "doing their work" (practicing their lessons and turning the results into the guide, doing small group research projects, etc.). The kid is encouraged to ask others for help understanding the lesson and to mentor others who are working on a lesson the kid knows. Once the guide observes the kid succeeding at the lesson, the kid is invited to the next lesson.
I guess in Montessori every single student isn't learning something different, but each one is often in a unique state of learning and development. The guide gives lessons in small groups, less than 6. Each kid gets a new lesson every few days and spends the remainder of their time "doing their work" (practicing their lessons and turning the results into the guide, doing small group research projects, etc.). The kid is encouraged to ask others for help understanding the lesson and to mentor others who are working on a lesson the kid knows. Once the guide observes the kid succeeding at the lesson, the kid is invited to the next lesson.