Of the following update procedures, which is the least important in achieving an accurate forecast...

 Schedule Update Procedures:

Accurate schedule updates rely on entering actual data (start/finish dates, durations) and evaluating impacts of changes.

"Downstream" logic revisions may be needed but are less critical compared to ensuring accurate historical data and reflecting immediate changes.

 PSP Study Guide References:

Schedule updating emphasizes capturing accurate historical data and estimating remaining durations accurately​.

 Analysis of Options:

Option A and B: Key to progress tracking and forecasting.

Option D: Essential for reflecting impacts of delays and change orders.

Option C: While important, downstream logic revisions are less immediate compared to other procedures.

 Conclusion: The correct answer is C, as downstream logic revisions are less critical in achieving an accurate schedule forecast compared to other updates