1. A method for determining which services in a service model to expose, the method comprising: determining a granularity of one or more services of the service model; re-factoring and refining a service portfolio and a hierarchy of the service model; adapting a Service Litmus Test (SLT) and service exposure scope to the service model; applying Service Litmus Tests (SLTs) to the service model; and verifying, with each affected stakeholder associated with the service model, that the service model achieves business and technical needs based on the results of the SLTs, which include tests to make exposure decisions, including whether to expose the service or not expose the service, wherein the service represent business capabilities and are placed in the hierarchy of the service model which represents the granularity.