6.3.2. The Mapping–Management Relationship and Map Elements

💡 First Principle: Mapping and management work as a loop — you map to understand, manage to improve, then re-map to verify — and a value stream map captures specific elements (steps, flows, times, hand-offs) that make waste and delay visible.

The relationship: value stream mapping produces the visual understanding that value stream management acts upon; management then drives changes, and re-mapping confirms whether flow improved. They form a continuous improvement loop rather than two separate activities. The elements of a value stream map typically include the sequence of steps or activities, the flow of work between them, the time taken at each step and waiting between steps, hand-off points, and indicators of where waste, delay, or bottlenecks occur.

The highlighted step illustrates how a map exposes a bottleneck — a step where wait time dwarfs work time — that's invisible when you look at activities in isolation.

⚠️ Exam Trap: A value stream map shows both work time and waiting time — the waiting (delay between steps) is usually where the biggest waste hides. A map that captures only the active steps misses the point of the exercise.

Reflection Question: Why is the waiting time between steps often more revealing than the work time within steps on a value stream map?