Free field notes / Updated 2026-10-21

Find Your Riskiest Business Idea Assumption

Map desirability, reachability, willingness to pay, and feasibility. Rank uncertain assumptions and choose the first test with a worked example.

Your riskiest assumption is an unproven claim that could make the idea fail or change substantially if it is false. Find it by mapping what must be true about the problem, buyer access, payment, and delivery, then ranking the claims by impact and uncertainty. Test the highest-priority claim with the smallest honest experiment that can change your next decision.

Turn an idea into claims you can examine

An idea often arrives as a solution: "A service that prepares display labels for local makers." That sentence hides several assumptions. Makers might already have satisfactory labels. They might need them only once. They might want help but be unwilling to pay enough for the work.

List claims without defending them. Use language that can be challenged by observation:

• Makers preparing a stall struggle to produce clear item labels.
• The struggle is important enough to address before their next market.
• You can reach suitable makers this week with permission.
• Some will pay US$25 for a defined label-preparation package.
• You can deliver the package within an hour of work.

These are hypothetical starting claims, not facts about makers. The purpose of writing them down is to make their uncertainty visible.

Map four kinds of assumption

Desirability

Does a specific person have a problem they care about solving? Look for a recent incident, an existing workaround, and a consequence. A person agreeing that clear labels are useful is not enough.

A testable claim is: "At least three of eight makers interviewed describe spending more than an hour preparing labels for their latest market and wanting that task reduced."

Reachability

Can you get the offer to relevant people through a channel you can actually use? Knowing that an audience exists is different from having permission to approach it.

A claim could be: "A local organizer will allow one relevant pilot invitation to reach makers preparing for next month's event." If permission is uncertain, resolve that before assuming you have a distribution channel.

Willingness to pay

Will someone choose the defined offer at the stated price? Interest, usage, and payment are different actions. A free sample may test usefulness while leaving the payment question open.

A claim could be: "Three of ten suitable makers who see the US$25 package will book a preparation slot." Keep the price attached to the scope throughout the test.

Feasibility

Can you deliver the promised outcome at a workable cost, speed, and quality? Include your own time, revisions, and materials. A one-off rescue using five hours of unpaid effort may not fit a US$25 package.

A claim could be: "I can prepare and check one set of twenty labels in sixty minutes using information the maker can supply accurately."

Check risk flags before ranking ordinary uncertainty

Some concerns need attention before a normal demand test. Regulated finance, medical, and legal ideas are not candidates for an ordinary score and test plan. Seek qualified guidance first.

Safety, privacy, permissions, dependence on someone else's platform, capital requirements, and ethical concerns can also change whether a proposed test is appropriate. Do not bury such a concern inside an average score.

The ranking method below is for prioritizing uncertain business claims after that screen. A low arithmetic score cannot make an unsafe or inappropriate test acceptable.

Rank impact times uncertainty

Use two simple internal scales from 1 to 5. For impact, 1 means a false claim causes a small adjustment; 5 means it breaks the present idea. For uncertainty, 1 means you have relevant direct evidence; 5 means you are mostly guessing.

Multiply the two scores to choose what to investigate first. This is a rule of thumb for organizing attention, not a validated probability model. Do not interpret a score of 20 as twice the actual risk of 10.

In this example, willingness to pay ranks highest. Reachability is less uncertain because the founder has already spoken to an organizer who welcomes an invitation. Without that permission, its uncertainty score would need reconsideration.

If two claims tie, prefer the one that blocks more future work or can be tested quickly. Document the reasoning instead of polishing the numbers until they select your favorite activity.

Work the example through to a test

1. Choose the claim. Suitable makers will book the US$25 package.
2. Define the offer. Twenty prepared display labels from the maker's supplied item details, with one review round.
3. State the status. This is a manually delivered pilot. An automated product is not built yet.
4. Set the exposure. Ten suitable makers preparing for an upcoming market see the complete offer.
5. Set the threshold. Three book a specific preparation slot by Sunday evening.
6. Define the response. A pass earns three manual deliveries. A miss triggers review of the observed objections before any software work.

Use no-payment reservations if you cannot yet confirm delivery. If collecting money before a product exists, make it refundable and explain the terms clearly. Do not collect payments simply to make the test look serious.

The offer should rely on the maker supplying accurate product information. Do not expand the test into advising on labeling requirements for products that need specialist guidance.

Update the map after observing behavior

Suppose two people book, four say they prefer handwriting labels, two need the labels sooner than you can deliver, and two do not respond. The threshold failed. That does not prove nobody will pay, but it does mean the stated test did not justify the planned next step.

The delivery deadline may deserve investigation, but do not declare it the sole cause without evidence. The four people satisfied with handwriting also matter. You may have chosen an audience whose current approach is good enough.

Update uncertainty using what actually happened. Reachability is now less uncertain because ten suitable people received the offer. Payment remains unresolved or weaker than hoped. Feasibility still needs a test if you choose to deliver the two genuine bookings.

Common mistakes

• Ranking the task you enjoy as the most urgent assumption.
• Treating research from unrelated buyers as direct evidence.
• Combining several claims into one sentence that cannot fail clearly.
• Using numerical scores to hide a safety or regulated-activity concern.
• Building a prototype when the unresolved question is buyer access.
• Repeating interviews when the unresolved question is a real purchase choice.

Use the separate four-dimension idea rubric to compare ideas. Use this assumption map to decide what to test within the idea you choose.

Next step

Paste your idea into the free triage tool, then write the one claim whose failure would most change your plans. Set a success threshold before choosing the most convenient experiment.