Managerial accounting focuses on activites for adding value to organizations. It does this by focusing on the "value chain" for its given products and services. Areas studied to improve the value chain are Technogical Changes, Just-In-Time Inventory, Total Quantity Management, Activity-Based Costing, Theory of Constraints and Lean Manufacturing. Pick 2 or 3 of these and provide a summary in your own words as to what they mean. Provide a Brief example where they may FAIL to provide value