Alonge Horac's motto "Sapere aude!" (which means: dare to be wise) PEER aims to support peer-to-peer learning approaches in later life which is challenged to design innovative approaches. Online social platforms (and especially senior platforms, such as 50plusnet.nl, seniorkom.at) hold a tremendous potential for sustaining the older people’s learning opportunities whose lives are bound by their immediate environment. Thus, PEER aims a) to identify, test and adapt a set of light weighted open source Web 2.0 tools and b) to investigate motivational factors for peer-to-peer learning of older people. All investigative activates will be based on participatory user involvement methods. By meeting the needs of a large and growing demographic group, the following core results are envisaged: 1. Guidelines (in the 23 EU languages) on how to motivate older people for P2P learning in general and on sernior platforms in particular, by instructing on pedagogical, organisation and technical aspects including quality standards for setting up targeted online P2P learning tools. 2. A package of customised open source Web 2.0 tools, translated into German, English, Dutch, Polish and Portuguese will be disseminated to operators of senior platforms and 3rd Age Universities throughout EU27. 3. Network meetings in the six partner countries with the target groups for continuous dialogue and exploitation purposes. PEER constitutes a significant breakthrough in the innovative application of Web 2.0 tools to enable older people to maintain their mental abilities. Consortium: 6 core partners (AT, G, NL, PL, PO, UK) and 5 strategic partners. Duration: 24 months