This document summarizes Session 1 of URBACT Lab 1. The session introduced the Allium City case study and covered defining problems, mapping stakeholders, and an introduction to working with the Local Support Group. Participants broke into small groups called ULSGs to use problem tree and stakeholder analysis tools to define key problems and assess stakeholder importance and influence for the city case. The session aimed to provide conceptual frameworks, tools, and techniques to support action planning work over four labs and ULSG sessions.