Learning tailored to optimally challenge each child at his/her ability level. Montessori teachers rarely teach to the whole class. Instead, they give lessons to small groups based on ability, readiness, and interest. This means that each child is constantly challenged at just the right level. A 2nd grader who is advanced in math may join a group of 3rd graders; if she struggles with reading, she may also join a group of 1st graders in literature circles. Because all instruction is individualized, and with a three-year age mix (1st – 3rd grade, and 4th – 6th are in one mixed-age community), children don’t compare themselves against others as much, and instead focus on their own personal goals and development.