This chapter introduces a conceptual metamodel which enables the assessment and semi-formal modeling of business processes in the domain of software engineering based on the UML metamodel. In addition to the definition of an appropriate process modeling method, a basis for performing empirical case stud-ies and structured process assessments is provided by defining and structuring the relevant process entities (artifacts, roles, tools), and process elements and their in-terdependencies on the metamodel level. Above all, some example models are presented which were developed by applying the introduced metamodel during an initial case study. The described metamodel allows the opportunity to create de-tailed organizational UML-based models which describe the relevant roles, work-flows, artifacts as well as the used tools and their interdependencies. Thus, it can facilitate a founded assessment, evaluation and re-engineering of organizational software development processes.