This document discusses strategies for staying agile as an organization grows and adds more teams to product development. It advocates adopting an operating model of autonomous, co-located, cross-functional product teams rather than separating teams by component or function. Case studies are presented of organizations that struggled when they did not adopt this full-product team approach. Advice is given to leverage people effectively, continuously improve technical practices, and avoid adding people and complexity when not needed. The focus is on how smaller organizations can sustain agility as they grow rather than transforming very large organizations.