methodatlas
Product Discovery

Riskiest Assumption Test

Moves customer problem, solution idea, and evidence toward a concrete result through "collect assumptions explicitly", "rate uncertainty and leverage for each assumption", and "decide to pivot, persevere, or stop".

Core question
Which assumption, if false, would endanger the initiative most, and what is the smallest possible test to examine this in 1-2 weeks?
MediumWorkshop + async1-2 Wochen pro Iteration
Open runsheetPlan sessionStart comparison
Purpose

Helps clarify customer problem, solution idea, and evidence in concrete terms. It separates problem, assumption, solution, and evidence. The result is captured as a prioritized list of assumptions, a test plan, and a result report.

How it works

The team follows the steps "collect assumptions explicitly", "rate uncertainty and leverage for each assumption", "mark the riskiest assumption", "define the smallest possible experiment", "run the test and document the result", and "decide to pivot, persevere, or stop". Each step is made visible. At the end, a prioritized list of assumptions, a test plan, and a result report are available so decisions, tests, or actions can continue directly.

Visual orientation

Method sketch for a quick mental model.

Riskiest Assumption Test · Top-Annahme zuerstMehrere Annahmen nach Unsicherheit und Hebel bewerten, die riskanteste isolieren und mit dem kleinsten passenden Experiment prüfen
Riskiest Assumption TestDas Visual zeigt mehrere Annahmen, eine Unsicherheit-Hebel-Matrix, die riskanteste Top-Annahme und das kleinste Experiment mit Entscheidungsregel.Erst die Annahme testen, die die Idee wirklich kippen kannRAT sortiert Annahmen nach Unsicherheit und Hebel, damit nicht das bequemste, sondern das wichtigste Experiment zuerst läuft.Annahmen sammelnwas muss wahr sein, damit die Ideeträgt?A NachfrageB MachbarkeitC ZahlungsbereitschaftUnsicherheit × Hebelzuerst testenABCTop-Annahmewenn C falsch ist, kippt die IdeeKleinstes Experimentschnellster Test mit echtem VerhaltenhochUnsicherheitHebelriskanteste AnnahmezuerstPivot, Persevere oder Stop

Flow

  1. 1Collect assumptions explicitly
  2. 2Rate uncertainty and leverage for each assumption
  3. 3Mark the riskiest assumption
  4. 4Define the smallest possible experiment
  5. 5Run the test and document the result
  6. 6Decide to pivot, persevere, or stop

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

Open runsheet

Ideal for

  • Early-phase discovery
  • Investment decisions
  • Innovation programs

Not good for

  • Already validated ideas

Deep dive

In detail

The Riskiest Assumption Test, often shortened to RAT, is a stricter version of the MVP idea. Popularized by Giff Constable, Rik Higham, and others, it asks for the one assumption whose falseness would most threaten the initiative. The right experiment is often smaller, cheaper, and faster than a classic MVP.

Facilitation

Collect all assumptions, sort them by uncertainty and leverage, then choose the top one. Define the experiment as small as possible.

Output artifacts
Liste priorisierter AnnahmenTest-PlanErgebnisbericht
Tags
experimentsvalidationdiscoveryassumptions

Sources

Lean startup - Wikipediaen.wikipedia.org
Artifact templates
Assumption Map ChecklistChecklist for critical assumptions by risk and knowledge level.
checklist

assumption-map-checklist.md

Checklist for critical assumptions by risk and knowledge level.

  • Formulate assumption as a testable statement
  • Assess risk
  • Assess level of knowledge
  • Add data source or test idea
  • Mark riskiest assumption
  • Define success criterion
  • Set owner and date
Experiment PlanShort plan for hypothesis, test design, success criteria, and decision.
markdown

experiment-plan-markdown.md

Short plan for hypothesis, test design, success criteria, and decision.

Experiment Plan

Hypothesis

We believe that ...

Target audience

Who are we testing for?

Test design

What exactly will participants or users do?

Success criterion

We count the test as positive if ...

Risks and limits

What can the test not prove?

Decision afterward

If positive: ... If negative: ...

Owner and date

...

When to choose differently

Short decision aid for existing alternatives.

Assumption Mapping

Statt Riskiest Assumption Test, wenn du mit Assumption Mapping Annahmen nach Unsicherheit und Risiko ordnen und dann gezielt testen willst.

Concierge MVP

Statt Riskiest Assumption Test, wenn du mit Concierge MVP den Wert manuell liefern und Lernsignale vor der Automatisierung bekommen willst.

Similar methods

All methods
Product Discovery
Experiment Canvas

Moves customer problem, solution idea, and evidence toward a concrete result through "clarify the learning goal and the assumption to test", "formulate the hypothesis as an if-then statement", and "define the decision rule after the test".

Product Discovery
Hypothesis Prioritization Canvas

Moves customer problem, solution idea, and evidence toward a concrete result through "take over the hypothesis list", "define the risk scale", and "select the top hypotheses for the next tests".

Product Discovery
MVP Test Matrix

Moves customer problem, solution idea, and evidence toward a concrete result through "list assumptions", "map assumptions to dimensions", and "derive the test plan".

Product Discovery
Dual-Track Agile

Verbindet kontinuierliche Product Discovery mit laufender Delivery, damit Teams lernen und liefern, ohne beides zu vermischen.

Product Discovery
Opportunity Solution Tree

Turns customer problems, solution ideas, and evidence into a tangible result by setting outcomes, collecting opportunities, and updating learning status.

Product Discovery
Assumption Mapping

Turns customer problems, solution ideas, and evidence into a tangible result through collecting assumptions, rating importance, and planning tests.

Statt Riskiest Assumption Test, wenn du mit Assumption Mapping Annahmen nach Unsicherheit und Risiko ordnen und dann gezielt testen willst.