The Formative Assessment in Science project was funded by HEFCE as part of the Fund for the Development of Teaching and Learning Programme. Its work was completed in March 2006. The project was centred on a strong collaboration between the Open University and Sheffield Hallam University, but also involved ~20 other universities in action learning activities aimed at improving formative assessment. The project partners used a conceptually and empirically based framework of conditions which, if met, lead to assessment that drives learning. The projects were diverse and the many positive assessment changes achieved demonstrate that the approach of a framework based analysis and careful evaluation can be successful in improving the student experience. I will summarise some of the main conclusions of the project. One concerns the creation of written feedback that promotes learning rather than merely justifying marks. A second covers the effective use of peer assessment. Finally, I will outline the tools that the project has generated. These will remain available for others to undertake similar reform activities.