Standard Work Sequence Verification checks whether the defined order of work is still practical and effective under real operating conditions.
The purpose is not to enforce sequence blindly.
The purpose is to confirm that the sequence continues to support:
- safety;
- quality;
- flow;
- repeatability.
Start with the current standard
Standard Work defines the best-known work sequence, timing, and standard in-process inventory for repeatable work.
Before observing, confirm which sequence is currently approved.
An outdated document cannot be used as a reliable comparison point.
Observe several cycles
Standard Work Observation helps compare defined and actual work at the Gemba.
Look for:
- skipped steps;
- reordered tasks;
- repeated backtracking;
- waiting inserted between steps;
- informal shortcuts.
One cycle may not represent normal work, especially when product mix changes.
Ask why sequence changes
A different sequence may indicate:
- missing material;
- poor layout;
- unsafe reach;
- quality concern;
- equipment delay;
- better method discovered.
Do not assume every difference is operator noncompliance.
Check quality protection
Some sequence points exist to prevent defects.
Examples include:
- clean before assembly;
- verify orientation before fastening;
- inspect before packaging.
If steps are reordered, confirm whether the change creates quality risk.
Quality at the Source helps build defect prevention and immediate response into the point of work.
Check flow impact
Sequence changes may increase:
- walking;
- WIP;
- waiting;
- handoff delay.
Yamazumi Chart can help visualize work content and balance when sequence changes affect station load or timing.
Control valid improvements
If the observed sequence is better, test it deliberately.
Standard Work Change Control helps evaluate, approve, document, train, and verify changes to the standard method.
The best-known method should improve through evidence, not informal drift.
In mixed-model work, verify the sequence across the combinations that materially change the task pattern. A sequence that works for one product family may create awkward handoffs or hidden waiting for another. Verification should reflect the real mix the workstation is expected to handle.
Common mistakes
Checking only whether the exact order was followed, observing one cycle, ignoring why the sequence changed, allowing useful improvements to remain unofficial, accepting shortcuts that weaken quality, and using sequence verification primarily as an operator-compliance audit are common mistakes.
Practical sequence
- confirm the current approved sequence.
- observe several cycles.
- record meaningful differences.
- ask why they occur.
- assess safety and quality effects.
- assess flow and timing effects.
- remove barriers to the intended sequence.
- test better methods where appropriate.
- update the controlled standard.
- verify the revised sequence in operation.
The practical lesson
Standard Work Sequence Verification keeps the defined method connected to reality.
The sequence should be followed because it works, and changed deliberately when evidence shows a better method.