Human resources are recognised as being key to the creation, commercialisation and diffusion of innovation. Among them, doctorate holders are not only the most qualified in terms of educational attainment, but also those who are specifically trained to conduct research. Not much is known however about their career and mobility patterns on the labour market. This is why the OECD launched in 2004 a collaborative project with the UNESCO Institute for Statistics and Eurostat aimed at developing internationally comparable indicators on the careers and mobility of doctorate holders.  An expert group with representatives from national statistical bodies was formed to develop the technical components of the project and start compiling data at national level.