CWI and INRIA already have well-established relations, notably through ERCIM. In October 2007 associations were strengthened when the two research institutes signed a special cooperation agreement. In 2008 they will start joint research projects in the fields of software service evolution and learning and computational economics. Typical problems that will be investigated are transformation of existing software to trustworthy software services and the optimalization of cost-benefit analysis in for instance patient planning. CWI researchers in Amsterdam will closely work together with INRIA researchers based at the new research centre INRIA Lille-Northern Europe. The projects will initially be carried out at CWI, but as things progress the cooperation could be extended to joint projects in France as well.