testland/test-effort-estimation

Turns a list of testable areas plus a change-shape distribution into a PERT three-point test effort estimate, reporting every row as a range around the expected value rather than a single number, requiring a named assumptions ledger across six mandatory categories, and recommending a per-layer ownership split across developer, automation, and exploratory roles. Owns the hours and the ownership recommendation only: it consumes a change-shape distribution rather than producing one, and it does not choose which tests to run or how deep coverage should go. Use when an epic or release has been broken into testable areas and someone is about to commit test capacity for a sprint.

Quality

94%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

Securityby

Passed

No findings from the security scan

Worked example - PERT arithmetic

Name: testland/test-effort-estimation
Rating: 75.2 (1 reviews)
Author: testland

Deep reference for the test-effort-estimation SKILL.md. The row-by-row PERT arithmetic behind the "Promo codes at checkout" epic, using the formulas from the spine (E = (a + 4m + b) / 6, SD = (b - a) / 6). The filled output document is in effort-estimate-output-template.md.

Epic: Promo codes at checkout (stories 12 to 15). Change-shape distribution supplied by the classifier: 30 percent service-layer, 25 percent ui-heavy, 25 percent pure-logic, 20 percent data-heavy. Three-point values gathered in a two-round Wideband Delphi with three estimators.

Row arithmetic:

Checkout flow (service):    E = (4 + 32 + 16)/6 = 8.7    SD = (16 - 4)/6 = 2.0
Checkout flow (UI/E2E):     E = (2 + 20 + 10)/6 = 5.3    SD = (10 - 2)/6 = 1.3
Discount-code API (service):E = (2 + 16 +  8)/6 = 4.3    SD = ( 8 - 2)/6 = 1.0
Discount rules (unit):      E = (3 + 20 +  9)/6 = 5.3    SD = ( 9 - 3)/6 = 1.0
Promo schema (data checks): E = (2 + 24 + 14)/6 = 6.7    SD = (14 - 2)/6 = 2.0
Checkout (exploratory):     E = (2 + 12 +  6)/6 = 3.3    SD = ( 6 - 2)/6 = 0.7

Aggregation:

E_total  = 8.7 + 5.3 + 4.3 + 5.3 + 6.7 + 3.3 = 33.6 h
SD_total = sqrt(2.0^2 + 1.3^2 + 1.0^2 + 1.0^2 + 2.0^2 + 0.7^2)
         = sqrt(4.00 + 1.69 + 1.00 + 1.00 + 4.00 + 0.49)
         = sqrt(12.18) = 3.5 h
Independent-rows range:   30.1 to 37.1 h
Fully-correlated bound:   sum(SD) = 8.0  ->  25.6 to 41.6 h

The two ranges are reported together because assumption A2 (staging availability) is shared by four of the six rows, so the independence assumption behind SD_total is known to be imperfect (Brunel University, Network analysis: uncertain completion times).