The document discusses the European Schoolnet's (EUN) efforts to build a Learning Resource Exchange (LRE) to improve access and reuse of educational content across Europe. It provides an overview of several related projects undertaken by EUN since 2002 to develop the LRE, including the CELEBRATE, CALIBRATE, and MELT projects. It describes the vision and goals of the LRE, which aims to federate educational content repositories across Europe through common technical and semantic standards to allow for interoperability and discovery of resources. The ASPECT project, launched in 2008, continues this work by assessing standards implementation and developing best practices for content exchange.