This part of the Technical Report provides a reference model for a Spatial Data Infrastructure (SDI). It covers framework standards and identifies the relevant standards, technical specifications, technical reports and guidelines. This part of the Technical Report provides a context model for the other parts of this Technical Report applying general architecture standards. The intended readership of this Technical Report are those people who are responsible for creating frameworks for SDIs, experts contributing to INSPIRE, experts in information and communication technologies and e-government that need to familiarise themselves with geographic information and SDI concepts, and standards developers and writers.