Behavioral Strategy vs COM-B / BCW #
Definition. COM-B (Capability, Opportunity, Motivation → Behavior) is a diagnostic model. The full Behaviour Change Wheel (BCW) process also includes selecting target behaviors and designing interventions. Behavioral Strategy makes behavior the unit of strategy for achieving outcomes. It defines the desired outcome and population, generates and evaluates multiple candidate behaviors, selects or invents the highest-fit behavior, validates Behavior Market Fit in real contexts, and then designs the system of products, programs, policies, and operations that enables and sustains the behavior.
From Behavioral Strategy, developed by Jason Hreha.
Quick decision rule #
Use COM-B to diagnose capability, opportunity, and motivation for a specified behavior. Use the full BCW process for target selection as well as intervention design. Use Behavioral Strategy if you want the Four-Fit workflow for comparing candidate behaviors and testing feasibility before scale.
These are overlapping choices. The BCW authors explicitly describe selecting a target behavior by considering its likely impact and how easy it is to change. See Atkins and Michie’s account of the BCW process.
Comparison table #
| Dimension | COM-B model | Full BCW process | Behavioral Strategy |
|---|---|---|---|
| Scope | Explain conditions for a specified behavior | Select and specify behaviors, diagnose barriers, design interventions | Compare candidate behaviors, test fit, design enabling systems |
| Main concepts | Capability, Opportunity, Motivation | COM-B, intervention functions, policy categories | Four-Fit, Behavior Fit Assessment, DRIVE |
| Target selection | Not a complete selection process by itself | An explicit part of the process | An explicit part of the process |
| Useful output | A diagnosis to investigate | A target behavior and intervention rationale | A behavior specification and fit-validation plan |
| Evidence boundary | Diagnosis still needs context-specific evidence | Applying the process does not guarantee effectiveness | The integrated approach has not been independently validated |
How they work together #
One possible integration is to use Behavioral Strategy’s fit questions when comparing candidate behaviors, then COM-B to investigate barriers and BCW to map intervention options. COM-B can also inform candidate assessment before a final behavior is chosen.
- Behavioral Strategy → selection and validation gates (Four-Fit)
- COM-B → diagnose barriers and enablers for a specified behavior during Research and Integrate, then revisit that diagnosis against observed results in Verify
- Full BCW process → support target-behavior selection during Research and intervention design during Integrate; evaluate the selected interventions during Verify
When to use each #
Use COM-B / BCW when:
- You need a diagnostic taxonomy for barriers and enablers
- You want the full BCW process to help select a behavior and design an intervention
Use Behavioral Strategy when:
- You need to decide which behavior to target
- You need evidence that the behavior is feasible in real context
- You need a sequence of validation gates before scale
The proposed distinction is the named fit gates and their sequencing, not exclusive ownership of behavior selection. The sources above do not show that Four-Fit or DRIVE produces better outcomes than BCW. See the evidence status before interpreting this workflow comparison as an effectiveness claim.
Frequently asked questions #
Are COM-B/BCW and Behavioral Strategy competing frameworks? #
They overlap. COM-B is a diagnostic model, while the full Behaviour Change Wheel process includes selecting target behaviors and designing interventions. Behavioral Strategy proposes its own fit gates and measurement workflow; comparative superiority has not been established.
When should you start with COM-B/BCW? #
Use COM-B to diagnose a specified behavior. Use the full Behaviour Change Wheel when you also need to select target behaviors, assess what must change, and choose intervention functions.
When should you start with Behavioral Strategy? #
Start with Behavioral Strategy when the right behavior is still unclear, or when you need to validate Behavior Market Fit (can/will) in real contexts before investing in solutions.
Can you use COM-B inside DRIVE? #
Yes. COM-B can inform Research, diagnose barriers during Integrate, and help interpret observed results in Verify. The full BCW process can also support target-behavior selection during Research and intervention design during Integrate.