IT maturity models measure:

While IT maturity can influence performance, maturity models primarily measure the underlying capabilities and processes that lead to performance, rather than performance itself (which is often measured by KPIs).

IT value is a measure of the benefit IT brings to the business; maturity models assess the capabilities enabling that value, not the value itself directly.

IT maturity models, such as CMMI or COBIT, evaluate the sophistication, consistency, and repeatability of an organization's IT processes, practices, and resources across various domains. They provide a framework to measure the current state of IT capabilities and identify areas for improvement to achieve higher levels of operational excellence and strategic alignment.

Outcomes refer to the results or impacts of IT activities; maturity models focus on the processes and capabilities that produce those outcomes, not the outcomes themselves.