Refers to the inherent feedback present within activities that allow children to independently assess their performance and make corrections without external evaluation. This feature is integrated into the materials in the Montessori environment, nurturing the child's critical thinking and reasoning abilities. By enabling self-correction, control of error fosters qualities such as attention to detail, concentration, and independence while encouraging persistence in learning. It empowers children to evaluate their success and learn from their mistakes, cultivating a mindset that can identify and address errors beyond the confines of external evaluation. Control of error is crucial in promoting child-centered learning and self-mastery in Montessori pedagogy.