Synthesis Quick Reference #

Evidence note: Any quantitative thresholds on this page are starter heuristics unless linked to the Evidence Ledger or a primary source + date. Calibrate by domain.

The Core Interpretation #

Behavior selection deserves early validation alongside context and execution.

The cases suggest this priority, but do not isolate the causal contribution of selection or establish that it outweighs execution quality.

The Behavior Fit Assessment (the three dimensions) #

Before you invest in solution design, screen candidate behaviors using the Behavior Fit Assessment.

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.

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.

Dispositional Fit #

Does this behavior match the population’s relatively enduring tendencies and preferences?

• High: The behavior draws on existing interests, values, preferences, characteristic priorities, and tolerances.
• Low: The behavior repeatedly demands tendencies or priorities that appear weak or uncommon in the target population.

“Identity Fit” is the legacy alternate name for this BFA dimension. Self-concept can be one signal in a specific case, but it does not define Dispositional Fit.

Capability Fit #

Can users actually perform this behavior in the real world?

• High: the population’s actual abilities, skills, and knowledge meet the behavior’s demands.
• Low: the behavior requires abilities or skills the population does not yet have. External time, access, and setup barriers belong under Context Fit.

Context Fit #

Does the environment support the behavior where it naturally occurs?

• High: the environment reliably triggers and enables repetition (tools, time, norms, infrastructure).
• Low: the environment blocks the behavior (time scarcity, stigma, interruptions, missing infrastructure).

The decision rules #

• Use a rating below the calibrated starting screen to identify a candidate bottleneck or evidence gap.
• Prioritize the behavior with the strongest minimum rating and clearest outcome path, then validate it through observation in realistic contexts.
• Execute via the DRIVE Framework, which maps directly to the Four-Fit Hierarchy.

The recurring patterns #

1. Match, don’t hack. The strongest strategies formalize and enable behaviors people already do (or already try to do).
2. Test context and execution together. A capable product can still require behavior that the real setting does not support.
3. Defaults are configuration, not magic. Defaults work best after behavior viability exists; they don’t create viability by themselves. See Why Nudges Fail.

Quick decision heuristic #

Next steps #

• Browse the Case Library to compare behavior-selection hypotheses with sourced outcomes and limits.
• Use the Behavior Fit Assessment Worksheet in your next Research sprint.