Thanks to loads of compelling research studies and best practice cases in open innovation (OI) carried out over the last decade, several companies nowadays begin to embrace and partially apply the new principles and methods OI offers. However, when managing open innovation at the project level, even experienced managers still go blank at the question: how to assess, control, and measure the performance of these activities? In this series of articles, we will address the above issue by discussing a general framework for an open innovation performance measurement system (Part 1). Given this framework, a metricsbased management toolkit will be presented that provides a suite of key performance indicators (KPIs) for a specific set of OI methods that demonstrates the key results of our Open Innovation KPI 2012 Study (Part 2).