A Legal Entitlements and Administrative Practices (LEAP) exercise is a systematic review of cases at risk of being underpaid to help the Department ensure it has met its legal responsibilities. The Department for Work & Pensions (the Department) uses LEAP exercises to make key decisions in situations where a mistake has been made that affects a large volume of cases. The exercise weighs the individual impact on each claimant against the overall impact on the Department and tries to establish a proportionate response. The LEAP guidelines do not have any legal standing, but adherence to it can be used in future litigation to show that the Department has taken a rational approach to the decision.26