What is Psychological capability?
Psychological capability encompasses the knowledge, cognitive skills, memory capacity, attention, and decision-making abilities needed to perform a behavior. In COM-B, it is the mental counterpart to physical capability.
How it works
Psychological capability barriers include: not knowing what to do (knowledge deficit), not understanding how to do it (comprehension deficit), not being able to plan the behavior (executive function), not being able to regulate emotional responses that interfere (emotion regulation), and not being able to sustain attention on the behavior (attentional capacity). Many psychological capability barriers are invisible because the person appears to understand the information but cannot translate it into action.
Applied example
A patient told to ‘follow a low-glycemic diet’ may nod in understanding but lack the psychological capability to identify low-glycemic foods at the grocery store, plan meals, and adapt recipes. The knowledge was delivered but the operational skills were not.
Why it matters
Psychological capability reminds intervention designers that knowing about a behavior and being cognitively able to perform it are two different things, often requiring different interventions.
