A model is a standard taxonomy that you create to describe a process, a service or in the case of TBM an entire IT organisation.
A model allows a standard, comparable view of input costs, services that result from those costs and units of production that come from the services. For example, the component costs of supplying a CRM system to users consists of the elements in the illustration.
This model can be shared and populated across your organisation regardless of the form and content of the underlying data that may exist in different repositories. The models you create are not limited to IT they can model anything.
The benefit is a single, comparable point of truth that reveals the relative efficiency of providing the same service in different parts of an organisation or group of organisations