This is a new framework document, under development, that brings together all of the patterns available for extending a 1EdTech specification. The aim is to create a single reference document for all of the extensions patterns that MAY be used in a 1EdTech specification. A 1EdTech specification will cite, and if necessary further profile, the extension patterns to be used (data model and service extension as appropriate). If a new extension pattern is identified, this will be added to this framework document and so ensure that a common approach is always used for any of the permitted extension techniques.