For example, a 2005 study in a Buffalo public Montessori magnet school "failed to support the hypothesis that enrollment in a Montessori school was associated with higher academic achievement".[
Some studies have not found positive outcomes for children in Montessori classrooms. For example, a 2005 study in a Buffalo public Montessori magnet school "failed to support the hypothesis that enrollment in a Montessori school was associated with higher academic achievement".[49] Explicitly comparing outcomes of Montessori classrooms in which children spent extra time with Montessori materials, a standard amount of time with the Montessori materials ('classic Montessori'), or no time at all with the materials (because they were in conventional classrooms), Lillard (2012) found the best outcomes for children in classic Montessori.[50]