1. A method for determining a service in a service model to expose, the method comprising: determining a granularity of a service of the service model; re-factoring and refining a service portfolio and a hierarchy of the service model, wherein the re-factoring and refining comprises at least one of: eliminating at least one service and consolidating at least one set of services; adapting a Service Litmus Test (SLT) and service exposure scope to the service model, wherein at least one SLT is a project customized SLT or a client customized SLT; applying at least one SLT to the service model, wherein each SLT applied to the service model is rated with an applicability of the SLT to the service; and verifying that the service model achieves business and technical needs based on the results of the SLT.