The quality, availability and usefulness of data is a key determining factor for the success of public procurement reform. This chapter outlines OECD research on the importance of public procurement data across a number of relevant areas, including an emphasis on transparency, procurement system monitoring, and accountability in the context of the 2015 OECD “Recommendation of the Council on Public Procurement”. The important role of e-procurement systems in supporting the collection and use of data is also examined. Against this background, the availability and use of data in the public procurement system in Colombia is explored, with particular focus on the quality of the data collected, real access to the data and opportunities for disclosure among a variety of stakeholders, citizen engagement with public procurement data and related accountability activities.