"It is increasingly difficult to find authentic Montessori education," says L'Ecuyer, who worries that some schools may simply be following a trend, without truly embracing the principles regarding child autonomy, or the length of the learning sessions – all of which could influence important outcomes. The lack of consistency in applying the method may explain why there is variability in measures of the Montessori method's benefits, including some failures to note any advantages over other educational systems.