This document discusses the Lean philosophy and Lean management. It begins by defining Lean as a philosophy, system and set of integrated tools to improve results by eliminating waste and promoting continuous improvement. The key aspects of Lean are outlined, including identifying customer value, value stream mapping, flow, pull systems and continuous improvement. The five steps to the Lean process are described. Four disciplines of Lean management are introduced: delivering value efficiently to customers; enabling people to lead and contribute; discovering better ways of working; and connecting strategy, goals and purpose. The integration of these disciplines to form a Lean management system is discussed. The document concludes by considering next frontiers for Lean, including new technologies and analytical tools to better understand and serve customers.