There is a distinction that most organisations have not yet made, and it is costing them more than they realise. The distinction is between capability and capacity.
Capability refers to what someone can do — their skills, knowledge, expertise, and performance under optimal conditions. Organisations invest heavily in capability: training, development, recruitment, performance management. These are all, in essence, capability interventions.
Capacity is different. It refers to what someone can sustain — the conditions under which their capability can be reliably expressed over time, without significant cost to their functioning, wellbeing, or performance in other areas.
A person can be entirely capable of doing something and still not have the capacity to keep doing it in the same way indefinitely. This is not a capability problem. It is a capacity problem. And most organisations are not equipped to see the difference.
The consequences of this blind spot are significant. When performance declines, the default interpretation is often a capability issue — a skills gap, a motivation problem, a question of effort or attitude. Interventions follow accordingly: more training, more feedback, more accountability.
But if the underlying issue is capacity — if the person is capable but depleted, capable but operating in conditions that are not sustainable — then capability interventions will not resolve it. They may, in fact, make it worse, by adding demand to a system that is already running low.
Making the capability–capacity distinction visible does not require organisations to lower their standards or reduce their expectations. It requires them to ask a more precise question: is this a capability issue, or a capacity issue? The answer determines what is actually useful.
Dr Stacey Savage
Psychology for Sustainable Functioning