The goal of lean manufacturing is to create repeatable and reliable processes that deliver the desired outcome and are void of waste.
Starting small and growing lean manufacturing practice is typically the best implementation method as Lean Manufacturing begins with a management attitude that waste must be eliminated from all processes.
Waste is any human activity that does not add value. Most business processes, on the shop floor or in the office, include a significant amount of waste that is rarely recognized as waste. Common examples of waste are: Walking; Waiting; Output that does not match demand or schedules; Moving materials or people; Products or services that do not meet expectations (Defects); Re-work (Defects); Unnecessary process steps, Inventory.