With iGuess2 we aim to revise and update the original iGuess course developed by a consortium of diverse and experienced partners who are fully committed to the idea, concept, realization and maintenance of a teacher training course on the integration of GIS in several subjects.The main objective of iGuess2 is to revise and update the original iGuess course materials to the latest software, ArcGIS v.10, and to improve the course with new content and exercises that fill the needs that emerged during previous iGuess courses. Secondly, the partners wish to continue their efforts on raising awareness on GIS and its importance and possibilities in education, contributing to alleviating two major impediments to introducing GIS in schools, i.e. knowledge and awareness.Our experience with the iGuess courses showed us that the availability of data, and importing them to a GIS, is the first and one of the most important hurdles that teachers are confronted with when developing their own exercises. Therefore, new exercises and iNotes specifically focussing on importing data, will be developed in iGuess2. The guidelines module will be updated and a new section on available data sources will be added, integrating the iGuess partners’ experience about effectiveness of teaching approaches. We want to provide teachers with better support so that they will experience no problems with data and are able to integrate GIS in their classroom. Last, a new module will be included, introducing Web-based digital mapping developments based on the Web-GIS software ArcGIS Online, thereby incorporating the use of Web 2.0 tools for collaboration and publishing and social networking. All course materials will be translated in the languages of the partner countries. The true impact with regards to increasing GIS knowledge and awareness in Europe will be measurable only on the longer term, through the cascade effect initiated by our course members who will act as pioneers, multipliers.