Definition
A period in which resources, people, materials or information remain idle because the process cannot continue.
Human Explanation
Waiting is time during which no value is created for the Customer.
Why it Matters
It is a fundamental Lean waste that extends Lead Time and reduces Efficiency.
Conceptual Boundary
Not all Waiting is unnecessary; some pauses result from technological or Safety requirements.
Practical Perspective
Analysing Waiting helps identify Constraints and opportunities to improve Flow.