Record the permitted overlap
Synthetic work: sorting starts at 09:00 for four hours. The supplied process allows scanning to begin two hours after sorting starts, using already sorted trays. Scanning takes three hours with a different operator. This two-hour lag is a local process input, not a general rule about scanning work.
| Task | Start | Finish | Input boundary |
|---|---|---|---|
| Sorting S-A | 09:00 | 13:00 | Full set |
| Scanning SC-A | 11:00 | 14:00 | Only sorted trays |
| Combined completion | Not applicable | 14:00 | All trays accounted for |
Check the lead-in before starting the follower
- Confirm predecessor start
- Add the approved two-hour lag
- Identify ready trays
- Start scanning with separate operator
If no sorted tray is ready at 11:00, keep scanning pending and revise the plan from observed readiness.
Scanning finishes at 14:00 under the supplied overlap. A finish-to-start assumption would defer scanning to 13:00 and finish at 16:00, while starting at 09:00 would ignore the agreed lead-in.
Sorting starts at 10:00 instead. What are the revised scanning start and finish?
Show the worked answer
Start at 12:00 and finish at 15:00, provided sorted trays are actually ready and the second operator is available.