Despite that fact that much is claimed regarding the value and benefits of homework, research about the impact on academic achievement is mixed, inconclusive, and sometimes contradictory. This is unsurprising given that homework involves the complex interaction of a number of factors, such as differences in children, teachers, tasks, home environments, measurements of learning. Until recently, research on homework has tended to focus on the correlation between time and achievement, with no consideration of the type or quality of the homework task. Researchers still disagree as to whether or not homework enhances achievement, although it is increasingly apparent that what matters is not the time spent on homework but the nature and value of the work being assigned.