From 2006 to 2011, EIM and the department of Organization Studies from UvT (UvT-OW) have participated in a temporary inter-organizational project. The aim of this project was to construct various databases with information on interorganizational projects and firms participating in them. These databases can be used for scientific and applied research into characteristics and performance of inter-organizational projects (IOPs). One of the databases constructed by EIM and UvT-OW is a database that contains information on various aspects of inter-organizational projects that involve (small and medium-sized) enterprises from either the construction sector or the knowledge-intensive business services (KIBS), where these aspects are judged by several (mostly 2) people involved in each project. This document describes how the information for this database has been collected1.