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Business & Strategy

Relative Importance Testing

Model #0642Category: Business & StrategyDepth to apply:

By Updated 3 sources

4 min read

Contents

  1. 1. Core Idea
  2. 2. How to See It
  3. 3. How to Use It
  4. 4. Founders & Leaders
  5. 5. Connected Models
  6. 6. One Key Quote
  7. 7. Summary & Further Reading
Business & Strategy
Section 1

Core Idea

Relative importance testing measures how much each factor (feature, attribute, message) drives choice or satisfaction when considered together — not in isolation. People say one thing in a survey and weigh factors differently in real decisions. The core idea: learn what actually drives behaviour by testing relative importance (e.g. max-diff, conjoint), then prioritise and message accordingly.

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Section 2

How to See It

Product & Roadmap
You're seeing Relative Importance Testing when teams run max-diff or conjoint to see which features or outcomes matter most in trade-offs — and roadmap and positioning shift to emphasise what actually drives choice.
Marketing & Messaging
You're seeing Relative Importance Testing when copy and creative are tested by attribute (price vs quality vs speed) and the winning message aligns with what relative-importance work said drove preference.
Pricing & Packaging
You're seeing Relative Importance Testing when willingness to pay or tier choice is modelled by attribute (e.g. support, limits, brand), and packaging is designed around the attributes that carry the most weight.
Section 3

How to Use It

Define the factors that might drive choice (features, benefits, price, brand). Use a relative-importance method: max-diff, conjoint, or regression on choice data. Interpret which factors carry the most weight when everything is considered together. Use results to prioritise product, messaging, and pricing — and to drop or deprioritise what doesn't drive behaviour.
Decision filter
"Do we know what actually drives choice when customers weigh options — or are we guessing from anecdotes or single-attribute surveys? If we're guessing, a relative-importance test can tell us what to double down on."
As a founder
Run a relative-importance study (max-diff or conjoint) on your key attributes or messages. Use it to set roadmap priorities, headline claims, and packaging. Re-run when you enter a new segment or category so you don't assume the same weights apply everywhere.
Section 5

Founders & Leaders

Charlie MungerVice Chairman, Berkshire Hathaway
Munger stresses "elementary, worldly wisdom" and weighing factors in combination — not one variable at a time. He uses mental models to assess relative importance of causes. Founders can apply this by testing relative importance explicitly: don't assume what drives choice; measure it so you prioritise and message on what actually moves the needle.
Section 7

Connected Models

Reinforces
Jobs to Be Done
Jobs to Be Done is the outcome the customer hires the product for. Relative importance testing can reveal which job dimensions or outcomes matter most when they choose — so you align product and message to the job that wins.
Tension
[Vanity Metrics](/mental-models/vanity-metrics)
Vanity metrics are easy to track but don't drive outcomes. Relative importance testing identifies what actually drives behaviour so you don't optimise for the wrong thing. Use it to avoid vanity metrics.
Leads-to
[Segmentation](/mental-models/segmentation)
Relative importance can differ by segment. Run the test by segment to see if different groups weight factors differently; use that to tailor product, message, or offer by segment.
Section 8

One Key Quote

"What you see is all there is — unless you test. People don't know the relative weight they give to factors; you have to measure it."
— Daniel Kahneman, Thinking, Fast and Slow
Section 11

Summary & Further Reading

Relative importance testing reveals which factors drive choice when considered together. Use max-diff, conjoint, or choice modelling; prioritise and message on what actually matters. Re-test by segment.
01
Measuring the Immeasurable — Allen Weiss (2010)
Article
Max-diff and relative importance in practice; application to product and messaging.
02
Conjoint Analysis — various
Article
Conjoint and choice-based methods for measuring relative importance and willingness to pay.
03
The Mom Test — Rob Fitzpatrick (2013)
Book
Customer conversations that reveal what matters; complement quantitative relative-importance work.

Why this matters next

mental modelsTrade-offs

Relative Importance Testing applied the Trade-offs mental model

mental modelsQuality

Relative Importance Testing applied the Quality mental model

mental modelsOne Variable

Relative Importance Testing applied the One Variable mental model

mental modelsJobs to Be Done

Relative Importance Testing applied the Jobs to Be Done mental model

mental modelsPositioning

Relative Importance Testing applied the Positioning mental model

mental modelsBrand

Relative Importance Testing applied the Brand mental model

Frequently asked questions

What is Relative Importance Testing?

Relative Importance Testing is a mental model used for better thinking and decision-making.

How do you apply Relative Importance Testing?

To apply Relative Importance Testing, identify situations where this framework is relevant, then use it as a lens to evaluate your options and decisions. The model is most useful when combined with other complementary mental models.

What category does Relative Importance Testing fall under?

Relative Importance Testing falls under the Business & Strategy category of mental models. Other models in this category can be found on the Business & Strategy hub page.

Why is Relative Importance Testing important?

Relative Importance Testing is important because it provides a structured way to think about problems that would otherwise be approached with intuition alone. Understanding this model helps you avoid common reasoning errors and make better decisions.

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