Check readiness against the reserved slot
The sample specialist slot is 10:00–11:00 and requires prepared input by 10:00. Preparation actually finishes at 10:20, so that slot is lost under the supplied rule. The next confirmed slot is 14:00–15:00. A one-hour packaging task follows the specialist result.
| Task | Original | Revised |
|---|---|---|
| Preparation | Ready 10:00 | Actually ready 10:20 |
| Specialist | 10:00–11:00 | 14:00–15:00 confirmed |
| Packaging | 11:00–12:00 | 15:00–16:00 |
Preserve preparation and rebook the dependent chain
- Record actual 10:20 readiness
- Close missed slot as unused
- Confirm 14:00 specialist slot
- Move packaging after the result
If the prepared input expires before 14:00 under the actual project rules, review its validity before reusing it; this sample assumes it remains valid.
The revised chain finishes at 16:00. Preparation is completed once; only the remaining work moves. Do not leave the original packaging hour marked feasible when its prerequisite now ends at 15:00.
How late is the revised finish relative to the original 12:00 finish?
Show the worked answer
Four hours later, at 16:00. The 10:20 preparation delay caused a lost slot rather than merely twenty minutes of downstream delay.