Definition
A method that maps the material flow and information flow of a product or service from demand to delivery on the same chart, using the current state map to expose waste and the future state map to define the next improvement direction.
In detail
Value Stream Mapping is an analysis tool in the Lean Conversion, not the "Lean Conversion Fundamentals" course itself. It takes the end-to-end value stream as its boundary, recording cycle time, waiting, inventory, information triggers, and customer takt, first drawing the real Current State, then designing a Future State that satisfies the principles of Flow, pull, and takt. A Flow Chart only describes the sequence of steps, whereas VSM must also show time, inventory, and information control methods, so it can reveal systemic waiting that local optimization cannot see.
Example in practice
A factory has a delivery lead time of twenty days, but actual processing time is less than two hours. The team walks backward from the shipping end to the supply end along the product family, draws the current-state VSM, and finds that time is mainly consumed in three batch waits and repeated confirmation of planning information. The future-state map changes two segments to continuous flow, uses kanban pull for the remaining steps, and writes improvement projects, responsible persons, and completion dates into the action plan.