The document has been written for Members of Parliament (MPs), parliamentary staff, political advisers to MPs and parliamentary strengthening experts. It can be used by parliaments who want to: – increase parliament’s oversight on policy delivery and consolidate the country’s legislative cycle, – revise the parliament’s Rules of Procedure to clarify its role in Post-Legislative Scrutiny, – introduce and guide a pilot-project on Post-Legislative Scrutiny in parliament, – identify the relevant structures and resources needed to establish Post-Leg capacity in parliament. The 15 principles are stated in the headline (in bold), followed by an explanatory paragraph for each principle. These principles are not exhaustive nor exclusive, but are intended to provide guidance in establishing realistic PostLeg practices, in line with the legal and procedural framework specific to each parliament. WFD sees value in the argument that Post-Legislative Scrutiny should be a more integral part of the parliamentary process. WFD is aware of the resource constraints facing parliaments and the need for a flexible approach. These principles therefore seek, as much as possible, to build on existing systems and procedures.