Four-Fit Evidence Readiness Checker #

Jason Hreha· Updated July 10, 2026

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.

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.

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.

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.

Decision context Domain and population: Observation window: Decision stakes:

Problem Market Fit evidence Observed solution-seeking rate (%): Pre-registered minimum rate (%): The measure, population, window, and threshold were registered before results were reviewed. Workarounds, willingness signals, and counterevidence are documented.

Behavior Market Fit evidence Observed target-behavior completion (%): Pre-registered completion threshold (%): Dispositional Fit provisional rating (1-10): Capability Fit provisional rating (1-10): Context Fit provisional rating (1-10): Calibrated BFA starting threshold used for prioritization: The behavior measure and decision rule were registered before results were reviewed. Behavior was observed in realistic contexts for the named population.

Solution Market Fit evidence Observed completion with the solution (%): Pre-registered minimum completion (%): Observed time to first behavior (minutes): Pre-registered maximum time (minutes): The measures, population, window, and thresholds were registered before results were reviewed. Friction and behavior-enablement evidence is documented.

Product Market Fit evidence Observed behavior retention for the named window (%): Pre-registered retention threshold (%): The cohort, window, population, and threshold were registered before results were reviewed. Economics or program-operations evidence is documented.

Four-Fit Evidence Readiness Checker #

What the checker evaluates #

See also #