Select a consistent sample
Owner role · Report owner
Evidence: Five completed same-type records use the same start/finish boundary and date window.
Work measurement / Team leads and delivery coordinators
Decision deskDelivery percentiles with a small completed sample
Calculate a nearest-rank delivery percentile from an invented sample and see why a small history does not guarantee a deadline.
State the sorting and rank convention, preserve sample size and identify the unfinished items omitted from the calculation.
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Decision desk
Decide before adding more work
Decision to make: Report the descriptive 80th percentile as six days under nearest-rank and decline to treat it as a calibrated promise.
Synthetic example: Five completed same-type items took 2, 3, 4, 6 and 10 elapsed days under one clock. A draft promises the next item will finish within its sample percentile.
Show the rank calculation
Owner role · Analyst role
Evidence: Sorted values and ceiling(0.8×5)=4 are visible; the fourth value is six.
Review the forecast claim
Owner role · Delivery lead
Evidence: The note identifies small-sample limits, unfinished exclusions and changed work conditions.
Worked reporting note
Invented planning text. Adapt it to your evidence and confirmed owners.
Historical sample note: n=5; nearest-rank p80=6 days. No calibrated future deadline confidence is asserted; check unfinished work and changed conditions.
A worked measurement study
Inspect the data. Trace the decision.
Every record here is synthetic. Use the rule to review your own evidence before taking action.
Invented records · inspect every count
| Completed item | Elapsed days |
|---|---|
| A | 2 |
| B | 3 |
| C | 4 |
| D | 6 |
| E | 10 |
On small screens, scroll a wide table sideways to see all columns.
Download example data (.csv) · Download method worksheet (.json)
Try the arithmetic
Local calculation sandbox
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Work through the rule
Sorted sample [2,3,4,6,10]; n=5; nearest rank for p=80 is ceiling(0.8×5)=4; selected value=6 days. At p=85 rank=5 and value=10: one rank step changes the result substantially.
Historical sample note: n=5; nearest-rank p80=6 days. No calibrated future deadline confidence is asserted; check unfinished work and changed conditions.
Keep evidence and inference separate
Observed
Five completed durations under one clock
Supports a descriptive nearest-rank result.
Unknown
Future-item completion probability
Do not turn this small sample into a promise.
Next check
Inspect unfinished ages and work-type changes
Keep limitations attached to planning use.
Questions about this workflow
Why is the result six days?
Nearest-rank selects position ceiling(0.8×5)=4 in the sorted list: 2,3,4,6,10.
Is six days a deadline guarantee?
No. It is a descriptive sample value, not calibrated future probability or accepted scope.
Should unfinished work be included as finished durations?
No. Report its age separately and disclose the completed-only sample boundary.
Does this create tasks in the product?
No. The brief is a manual planning resource. Use the product access link to check onboarding and the workflows available in your account.
Put the outline to work
- Keep comparable completed records and disclose exclusions.
- State a percentile convention, sort values and choose the stated rank.
- Treat the result as descriptive evidence; review changes before using it in a planning discussion.
From a useful outline to team work
Explore TeamBoostAI for your team
Use this manual measurement rule as context when planning or reviewing owned work in TeamBoostAI. Confirm the fields and reports available in your account; the worksheet is not imported automatically. Confirm the workflows available in your account before adopting this outline.
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Opens the current invite-request page. Access is subject to approval; this example is not imported automatically.