This document discusses the need for open innovation in the public sector. It outlines a framework with 7 mechanisms (such as involving citizens, open data, and challenges & competitions) and 1 enabler (managing ecosystems) to achieve 2 objectives: better public services and stimulating economic growth. Open innovation is needed because public sector solutions developed in-house are often high-cost, local, and fragmented, while open innovation can empower entrepreneurs and communities to co-develop more innovative and cost-effective solutions.