Four-Fit Evidence Readiness Checker #
Pre-release and unsupported. This checker reports whether evidence and pre-registered decision rules are present. It does not determine viability, estimate behavior probability, or replace domain judgment. No data is stored.
Four-Fit is the ordered validation hierarchy of Problem Market Fit, Behavior Market Fit, Solution Market Fit, and Product Market Fit.
The Behavior Fit Assessment is a practitioner decision tool for comparing candidate behaviors across Dispositional Fit, Capability Fit, and Context Fit. It is not a validated measurement instrument. Treat the minimum dimension as a bottleneck and prioritization heuristic; it is not a deterministic probability of behavior.
“Identity Fit” is retained only as the legacy alternate name for Dispositional Fit. Dispositional Fit concerns relatively enduring tendencies and preferences, not self-concept or an aspirational identity.
A score of 6 out of 10 on each Behavior Fit Assessment dimension is a starting threshold that must be calibrated by domain, population, context, stakes, and observed behavior. Enter the threshold your team actually pre-registered. Do not adopt 6 automatically.
How to use it #
Enter the population, observation window, and decision stakes. Add the observations and the rules your team registered before reviewing the results. Confirm only evidence you actually have. Select Check evidence readiness and read each stage’s readiness and comparison separately. Missing entries stay missing; they are not treated as zero.
What the checker evaluates #
For each stage, enter the observed measure and the threshold registered before results were reviewed. The output distinguishes:
- missing evidence;
- missing or unconfirmed decision rules;
- a mechanical comparison with the supplied rule; and
- readiness for a domain-specific human review.
It never labels a project viable, nonviable, passed, or failed.
Evidence readiness by stage
Problem Market Fit
Behavior Market Fit
Solution Market Fit
Product Market Fit
View result data (JSON)
Completed example #
Illustrative input, not a study or recommended threshold. Use “new users of a bill-payment service” for domain and population, “first 30 days” for the observation window, and “small pilot review” for stakes. Assume that every evidence and pre-registration checkbox can truthfully be confirmed.
| Stage | Observed inputs | Rules registered for this example | Expected comparison |
|---|---|---|---|
| Problem Market Fit | Solution-seeking rate: 40% | Minimum rate: 30% | Meets the supplied rule |
| Behavior Market Fit | Completion: 55%; Dispositional Fit: 7; Capability Fit: 5; Context Fit: 6 | Completion: 60%; provisional BFA threshold: 6 | Completion and minimum BFA rating do not meet their supplied rules |
| Solution Market Fit | Completion: 70%; time to first behavior: 4 minutes | Completion: 65%; maximum time: 5 minutes | Both meet the supplied rules |
| Product Market Fit | Behavior retention: 45% | Minimum retention: 40% | Meets the supplied rule |
With these inputs and confirmations, all four readiness fields say ready for domain-specific human review. The behavior comparisons still say does not meet the supplied pre-registered threshold. Readiness means there is a record to review, including unfavorable observations. It does not mean the project is viable or should advance. The reviewer must assess the low Capability Fit rating, observed completion, outcome contribution, harms, and the quality of each rule before deciding what to change or test next.
Output format for developers #
Machine-readable output uses schema_version: "2.0.0", Four-Fit 2.0.0, BFA 2.0, and the comparison-1-10-v1 BFA profile. No stable legacy checker schema existed; consumers must inspect schema_version before parsing the output.