This document discusses tips and lessons learned from Barcelona Urban Lab's process of connecting challenges faced by the city of Barcelona to innovative solutions proposed by multidisciplinary teams. It recommends involving stakeholders from the beginning, balancing open and targeted calls, focusing on challenges rather than prescribed solutions, and ensuring legal compliance. It also stresses the importance of metrics, political support, external partnerships, and using public procurement to stimulate innovation. The overall goal is to help Barcelona remain open and proactive in addressing urban problems through bottom-up engagement and new ideas.