Lean Silver Core Reference Material Exam questions are based on specific Core Reference Material selected by knowledgeable and experienced individuals. Lean Product and Process Development 2nd Edition The Toyota Way: 14 Management Principles from the World's Greatest Manufacturer, 2nd Edition Practical Lean Accounting: A Proven System for Measuring and Managing the Lean Enterprise Gemba Kaizen, Second Edition Lean Thinking: Banish Waste and Create Wealth in Your Corporation Purchase Silver Reference Material Package The Lean Alliance has updated the Lean Silver Book Package and Lean Silver Exam. If you have purchased and are studying for the silver exam using the old silver book package you will have up to six months to complete the old exam with the old book package. Anyone applying for the exam after January 22, 2025, should purchase the updated Lean Silver Book Package.