The most useful first change to a setup may happen before anyone touches the machine. Observe the whole sequence, including the preparation and waiting that a single duration cannot explain.
Separate the kinds of work
SMED distinguishes internal setup, which requires a stopped machine, from external setup, which can happen while it is running. The Lean Enterprise Institute describes this separation, and the conversion of suitable internal work to external work, as central to the method.
That distinction is a question to investigate with the site team. It is not permission to move a task beside running equipment. Safety, isolation, cleaning and quality requirements determine what is permissible for the particular machine and process.
Record what actually happens
Choose a recurring transition and agree how it will be observed. Capture the sequence in plain language: a part is collected, an instruction is checked, a setting is adjusted, a sample is reviewed. Record the beginning and end of each observed activity where practical.
Include the work before the stop and the steps needed to reach the agreed finish condition. Ask operators to explain unfamiliar actions. A step that looks unnecessary to an observer may protect quality or prevent a problem later in the run.
Review one candidate together
For each activity, ask whether it truly needs the stopped equipment and what would have to be ready to perform it elsewhere in the sequence. Keep proposed changes distinct from approved methods.
A fictional example: the team collects a format kit after stopping, although an authorized staging area is available beforehand. The candidate improvement is to test earlier staging with an assigned owner. It is not to rush the collection or remove a required verification.
Document the dependency as well as the action. Earlier staging only works when the kit, space and responsible person are available at the right time.
Observe the revised sequence
Agree on a limited trial through the site’s existing process. Compare the next equivalent transition with the baseline, including quality and workload. A shorter stop that creates rework elsewhere needs a different conversation.
Use the result to update your understanding of the work. The purpose of the observation is a better-designed sequence that the team can repeat, not a one-off record set by working harder.
Take it to the line.
Map a single transition into observed activities. Review one possible preparation change with the people who perform the work before setting a time-saving target.
Further reading
A Cadensa discussion guide. Adapt the ideas to your site’s approved procedures.
