This document provides lessons on developing an STP (Sustainability and Transformation Plan) and ACS (Accountable Care System) through place-based integration of the NHS and local government. It outlines common challenges to working together such as organizational complexity, differing statutory requirements, and short-term targets conflicting with long-term plans. The document proposes a framework for working well together with shared leadership, commitment to shared visions and plans, governance structures for place-based working, and shared accountability for agreed plans. Practical actions include agreeing shared financial and delivery models, metrics, and contractual forms while pooling resources and incentives.