The practice of acknowledging and allowing for different levels of attainment in a group of learners. This may be done through differentiation by activity, which involves the teacher in planning and providing different activities for learners who may be working at a higher or lower level of attainment than the majority. These are known as differentiated activities. It may also be applied to the assessment of learners, through differentiation by outcome, where multi‐level assessment tasks are set which allow learners to respond at a level appropriate to their ability or attainment. Another means of differentiated assessment is to set different tasks or questions for different ability groups, as is the practice in the examination of some General Certificate of Secondary Education subjects. Two terms associated with differentiation in schools are ‘enrichment’, which is the provision for more capable learners to study a subject or topic in more depth; and ‘extension’, which is the provision for accelerated progress through all or part of the curriculum. See also tiering.