Chapter 5 – Managing the Test Activities
Wideband Delphi – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
An expert-based, iterative estimation technique in which estimators anonymously provide individual estimates that are then discussed and refined until consensus is reached.
In simple words
Experts estimate anonymously in rounds, discuss the outliers, and repeat until they converge.
Exam tip
Planning Poker is a lightweight, agile variant of Wideband Delphi.
Related terms
- Planning PokerA game where everyone flips an estimate card at the same time to avoid anchoring.
- Test Effort EstimationEstimate how much time and how many people the testing will need, using metrics, expert judgment or comparison to past projects.
- Three-Point EstimationEstimate best-case, worst-case and most-likely, then combine: E = (O + 4M + P) / 6.
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