SIPER stands for Science and Innovation Policy Evaluations Repository, which is a central source of knowledge on science, technology and innovation (STI) studies evaluation reports. Furthermore, it is embedded in a larger scale multi-partner effort, entitled the Research Infrastructure for Science and Innovation Policy Studies (RISIS) project, now having started its second round aiming at interconnecting datasets from various disciplines. SIPER's objective is mainly to identify, collect and characterise evaluation reports of STI studies for presenting them to wider stakeholders and to conduct academic research by analysing these evaluations.