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Buffer Time: Plan a Reserve around Estimation Uncertainty

Summary

Learn to set buffer time from actual estimation differences, distinguish recurring workload from uncertainty, and revise the plan when reserves are used.

Published

Set Buffer Time from Recorded Estimation Differences

Buffer time is a reserve for delay or unplanned work. Give the reserve a purpose rather than leaving an unexplained gap.

Its size depends on the work and variation. Review actual duration against estimates instead of assuming one percentage fits every task.

Compare Estimated and Actual Duration

Record the estimate and actual time for a page update, including asset waits, revisions, and checks. Distinguish active effort from waiting to investigate causes.

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Locate the Reserve Where It Is Needed

Unfamiliar work and daily support demand need different reserves. Recurring duties belong in the ordinary workload estimate.

When demand consistently exceeds capacity, review scope or staffing. Adding buffer alone may not solve the mismatch.

Use Reserve Consumption to Improve Estimates

Record where and why the reserve was used, updating routine estimates when needed. Use unspent time for agreed work or breaks.

Update service intake information when conditions change, reflecting the period you can actually support.

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Frequently asked questions

Q: What buffer percentage is needed?

A: There is no universal percentage. Use recorded variation and uncertainty.

Q: Should daily support use the buffer?

A: Plan recurring demand as normal work and distinguish unexpected variation.

Q: What if the reserve is always insufficient?

A: Review workload, scope, staffing, and estimation assumptions.

Q: What happens to unused time?

A: Use an agreed work or break option, and review future estimates from the record.

Sources

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