Generate a full detail guide on applying lean principles to a non-manufacturing business. The guide must adapt industrial concepts for a modern office environment. It should include detailed sections on: 1. A simple explanation of the core principles (e.g., eliminate waste, continuous improvement). 2. How to identify the '8 Wastes' in a service or software business (e.g., wasted time, unnecessary features). 3. A guide to implementing a 'Kanban' system for workflow visualization. 4. The concept of the '5 Whys' for root cause analysis. Please include a supportive disclaimer.