Why standard work matters
Without a standard, every shift does the job slightly differently. Variation in method leads to variation in safety, quality and output, and it is impossible to tell whether a change is an improvement. Standard work creates a stable baseline: once everyone follows the same method, problems become visible and improvements can be locked in.
The three elements
- Takt time. The rate at which the customer needs product, calculated as available working time divided by customer demand.
- Work sequence. The exact order of steps an operator performs within one cycle, including key points for safety and quality.
- Standard in-process stock. The minimum amount of work in progress needed to keep the process running smoothly.
Common standard work documents
- Standard work sheet: layout of the work area, operator path and sequence.
- Standard work combination table: manual, machine and walking time against takt.
- Job instruction or job breakdown: major steps, key points and the reasons for them, used for training.
- Process capacity sheet: machine capacity for each step.
Outside discrete manufacturing, the same idea appears as standard operating procedures, changeover standards, cleaning and sanitation standards, and standard checklists.
How to create it
- Observe the current method at the gemba and time each step.
- Agree the best current method with the operators who do the work.
- Document it simply, with photos where possible, and post it at the workstation.
- Train everyone to the standard and verify they can perform it.
- Check adherence regularly through leader standard work and audits.
- Update the standard whenever an improvement is proven.
Common mistakes
- Writing standards in an office without the people who do the work.
- Treating the standard as fixed. Standard work is meant to change as the process improves.
- Documenting it but never checking whether it is followed.
- Blaming operators for deviations instead of asking why the standard could not be followed.
For example, a food plant has three shifts performing the same allergen changeover in different ways and different times. The team observes each shift, combines the best elements into one sequence with clear key points, trains all operators and adds a check to the supervisor's routine. Changeover time stabilises and the next improvement starts from a known baseline.