methodatlas
Decision Making

Three-Point Estimation

Moves options, criteria, and risks toward a concrete result through "clarify the estimate object", "determine the optimistic value", and "derive the range, expected value, and risks".

Core question
Which realistic range from optimistic to pessimistic describes the estimation object, and which risks drive the difference between the three values?
MediumWorkshop + async10-30 min je Item
Open runsheetPlan sessionStart comparison
Purpose

Helps clarify options, criteria, and risks in concrete terms. It separates options, evaluation criteria, and open risks. The result is captured as a Three-Point Estimate, Risk Range, and Assumption Notes.

How it works

The team follows the steps "clarify the estimate object", "determine the optimistic value", "determine the most likely value", "determine the pessimistic value", and "derive the range, expected value, and risks". Each step is made visible. At the end, Three-Point Estimate, Risk Range, and Assumption Notes are available so decisions, tests, or actions can continue directly.

Visual orientation

Method sketch for a quick mental model.

Three-Point Estimation · O / M / POptimistischen, wahrscheinlichsten und pessimistischen Wert sichtbar machen, um Aufwand als Range statt Einzelzahl zu verstehen
Three-Point EstimationDas Visual zeigt optimistische, wahrscheinlichste und pessimistische Schätzung als Bandbreite mit Risk Range und Planungsannahme.Unsicherheit als Bandbreite statt als Einzelzahl schätzenOptimistisch, wahrscheinlich und pessimistisch machen Risiko sichtbar und liefern eine bessere Planungsannahme.SchätzobjektAufwand, Dauer oder Kosten klarabgrenzenrealistische BandbreiteO4 dOptimistischgünstig, aber plausibelM8 dMost Likelyhöchste WahrscheinlichkeitP16 dPessimistischungünstig, aber plausibelnicht als Zusage lesenExtremwerte erklärenRisk RangeBreite zeigt Unsicherheit und GesprächsbedarfPlanungsannahmeRange, Erwartungswert und Risikendokumentieren

Flow

  1. 1Clarify the estimate object
  2. 2Determine the optimistic value
  3. 3Determine the most likely value
  4. 4Determine the pessimistic value
  5. 5Derive the range, expected value, and risks

The runsheet guides execution with 5 phases, timeboxes, 5 pitfalls, and clear stop criteria.

Open runsheet

Ideal for

  • Uncertain tasks
  • Project planning
  • Risk assessment

Not good for

  • Very small standard tasks
  • Large unsliced epics
  • Teams without context

Deep dive

In detail

Three-Point Estimation forces uncertainty into the open. The optimistic value describes a favorable but realistic path, while the pessimistic value describes an unfavorable but still plausible path. The most likely value is where experts see the highest probability. The three values can feed simple ranges, risk discussions, or weighted approaches such as PERT.

Facilitation

Clarify whether effort, duration, or cost is being estimated. Ask for realistic extremes rather than fantasy scenarios. Use the width of the range to discuss risk, dependencies, and missing information.

Output artifacts
Three-Point EstimateRisk RangeAssumption Notes
Tags
estimationuncertaintyrangeforecasting

Sources

Three-point estimation - Wikipediaen.wikipedia.org
Artifact templates
Three-Point Estimation Working TemplateCompact working template for Three-Point Estimation with context, input, output artifacts, and next step.
markdown

three-point-estimation-working-template.md

Compact working template for Three-Point Estimation with context, input, output artifacts, and next step.

Three-Point Estimation Working Template

Goal

Estimates optimistic, most likely, and pessimistic value to make uncertainty explicit.

Context

When and for what do we use this method?

Input

Which data, observations, decisions, or materials are available?

Execution

Short notes along the runsheet.

Output artifacts

  • Three-Point Estimate:
  • Risk Range:
  • Assumption Notes:

Assumptions and open questions

  • ...

Decision / Next step

Owner, date, and success signal.

When to choose differently

Short decision aid for existing alternatives.

Planning Poker

Statt Three-Point Estimation, wenn ihr Schätzungen relativ kalibrieren wollt und gemeinsame Annahmen offenlegen möchtet.

Ideal Days

Statt Three-Point Estimation, wenn ihr Aufwand in reinen Arbeitstagen ausdrücken wollt und Teamkalibrierung beherrschbar halten möchtet.

Similar methods

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PERT Estimation

Moves options, criteria, and risks toward a concrete result through "collect three values", "explain the formula", and "document the planning assumption".

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Wideband Delphi

Moves options, criteria, and risks toward a concrete result through "clarify the estimate object and unit", "collect independent estimates", and "document another round and the outcome".

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NoEstimates

Moves backlog, sprint work, and team flow toward a concrete result through "clarify the planning question", "slice work smaller", and "calibrate regularly with reality".

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Delphi Method

Turns options, criteria, and risks into a tangible result by defining the question and panel, querying in the first round, and deriving the outcome in the next round.

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Argument Mapping

Clarifies options, criteria, and risks by framing the central question, recording the main claim, and marking weak spots.

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Cynefin Workshop

Turns options, criteria, and risks into a tangible result by collecting cases or challenges, explaining the Cynefin domains, and deriving the next actions.