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Assumption Mapper

Identify, prioritize, and test your assumptions

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Practical guide

Assumption Mapper

Map and test risky assumptions using the Certainty vs. Importance matrix.

How to use this tool

  1. 1List all assumptions about your product/project
  2. 2Rate each assumption for Certainty (how sure are you?)
  3. 3Rate each assumption for Importance (business impact)
  4. 4High Importance + Low Certainty = Test First (risky!)
  5. 5High Importance + High Certainty = Monitor
  6. 6Low Importance + Low Certainty = Ignore for now
  7. 7Design experiments to test critical assumptions
  8. 8Update ratings based on test results

Useful tips

  • Test First quadrant = your highest risk assumptions
  • Design cheap, fast experiments before building features
  • Common assumptions: "Users will pay $X", "We can build in Y months"
  • Customer assumptions are more critical than technical ones
  • Review weekly in early stages, monthly once validated
  • Move items to "Validated" quadrant only after real evidence

Related visual tools

Tool field guideDecision MakingCREATE

A practical guide to Assumption Map

Assumption Map is a browser-based decision making tool. Its maintained purpose is to identify and test assumptions in strategy or product plans. In practice, it supports starting a visual from an empty workspace or a focused prompt, with decision analysis providing the closest conceptual frame.

Verified against the maintained tool definition and its reproducible Try Demo fixture on August 9, 2026.

Reproducible worked example

Try the “Startup Assumptions” example

Starting point

Load the built-in “Startup Assumptions” demo. It starts with labels such as No additional regulatory review is needed initially, Cloud costs stay under $2K/mo at 10K users, We can acquire users at less than $50 CAC, Users will pay $29/mo for our tool, and Team can ship MVP in 3 months.

What to verify

Use Assumption Map to identify and test assumptions in strategy or product plans. The demo should produce an explicit comparison in which the alternatives and evaluation structure stay visible; confirm that No additional regulatory review is needed initially, Cloud costs stay under $2K/mo at 10K users, and We can acquire users at less than $50 CAC appear in the result.

The example is derived from the maintained fixture behind Assumption Map's Try Demo control, rather than from an invented scenario. It exercises the “create a new visual” workflow with decision analysis and visual thinking as review lenses.

Demo evidence ID: e802247a60724239

When this tool is useful

Designed for people comparing alternatives, setting priorities, or documenting a choice.

  • Assumption Map can help make visual thinking explicit before details are copied into a report, presentation, or follow-up tool.
  • For people comparing alternatives, setting priorities, or documenting a choice, Assumption Map provides a focused way to identify and test assumptions in strategy or product plans.
  • Use Assumption Map when starting a visual from an empty workspace or a focused prompt, especially when decision analysis is central to the problem.

Method and quality check

  1. 1

    Prepare for Assumption Map

    Name the decision, alternatives, criteria, and assumptions before assigning scores or positions. Keep the first Assumption Map example small enough to inspect without zooming or filtering away important context.

  2. 2

    Work with the tool's stated purpose

    Identify and test assumptions in strategy or product plans. Build a small first version before adding detail so the structure stays easy to revise.

  3. 3

    Check the result

    After using Assumption Map, change one uncertain score or assumption at a time to see whether the preferred option remains stable. The first draft should make its central subject and major groups understandable at a glance.

Related concepts and entities

Decision analysis
A structured comparison of alternatives, assumptions, criteria, and consequences.
Visual thinking
Using spatial arrangement, marks, and relationships to reason about information.
Prioritization
Ordering choices by explicit factors such as impact, urgency, confidence, and effort.

Limits worth checking

  • Assumption Map should be judged against its stated job, "Identify and test assumptions in strategy or product plans", rather than against features claimed by a different MAPb2 page.
  • For Assumption Map, remember this boundary: a structured score makes reasoning visible, but the result is only as sound as its evidence, weights, and alternatives.
  • A useful Assumption Map review criterion is straightforward: the first draft should make its central subject and major groups understandable at a glance.
  • When using Assumption Map, remember that the tool runs in a web browser. Before entering sensitive material, review this page's save, export, and sharing controls for the workflow you intend to use.

How Assumption Map differs from a nearby tool

Assumption Map is for people who need to identify and test assumptions in strategy or product plans. Pros & Cons Weigher is a nearby option, but its maintained focus is different: weighted pros and cons with animated balance visualization.

Questions about Assumption Map

What is Assumption Map best used for?

Identify and test assumptions in strategy or product plans. Assumption Map can help make visual thinking explicit before details are copied into a report, presentation, or follow-up tool.

Which ideas are related to Assumption Map?

For Assumption Map, Decision analysis, Visual thinking, Prioritization are the closest concepts in this guide. A structured comparison of alternatives, assumptions, criteria, and consequences.

What should I check after using Assumption Map?

For Assumption Map, remember this boundary: a structured score makes reasoning visible, but the result is only as sound as its evidence, weights, and alternatives. A useful Assumption Map review criterion is straightforward: the first draft should make its central subject and major groups understandable at a glance.

Is Assumption Map free to use?

Yes. Assumption Map is part of the free MAPb2 browser-tool collection. House-product recommendations may appear around the page, but they do not lock this tool.

What can I use before or after Assumption Map?

Assumption Map connects most closely to these maintained MAPb2 pages: Pros & Cons Weigher, Analogical Think Map, BPMN Flow Editor. Choose among them by whether your next step is to create, enhance, convert, export, analyze, or present the same material.

References and verification

The worked example above comes from this tool's maintained Try Demo fixture. These primary standards and method references explain the relevant format, interaction model, or review practice; they do not imply endorsement of MAPb2.

Browse Decision tools guidesBrowse create workflows

Other mind mapping tools upload your data to the cloud. We don't. Everything happens right on your computer. Your brainstorms, project plans, and strategic documents never leave your device. Nothing to leak. Nothing to hack.

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