Lean was first applied in manufacturing, arguably evolving out of the Toyota Production System, it is now applied widely to service and administrative processes as well. Lean, in comparison with other business improvement processes such as Six Sigma, relies on intuitive concepts rather than complex mathematics. Thus, a short, non-technical, understandable, and engaging text can successfully convey the essential principles of Lean and empower the reader. Besides describing the concepts of Lean, plentiful examples and brief case studies illustrate the application of Lean in different contexts including manufacturing, healthcare, food service, administrative processes, distribution, and retail. Besides giving a clear idea of how to apply Lean in various contexts, the examples illustrate which Lean tools are most appropriate in the various contexts.