Enterprise Resource Planning (ERP) solutions provide generic off-the-shelf reference models usually known as best practices . The configuration !individualization of the reference model to meet specific requirements of business end users however, is a difficult task. The available modeling languages do not provide a complete configurable language that could be used to model configurable reference models. More specifically, there is no algorithm that monitors the transformation of configurable UML Activity Diagram (AD) models while preserving the syntactic correctness of the model. To fill these gaps we propose an extended UML AD modeling language which we named Configurable UML Activity Diagram (C-UML AD). The C-UML AD is used to represent a reference model while showing all the variation points and corresponding dependencies within the model. The C-UML AD covers the requirements and attributes of a configurable modeling language as prescribed by earlier researchers who developed Configurable EPC (C-EPC). We also propose a complete algorithm that transforms the C-UML AD business model to an individual consistent UML AD business model, where the end user\u27s configuration values are consistent with the constraints of the model. Meanwhile, the syntactic correctness of the transformed model is preserved. We validated the Transformation Algorithm by showing how all the transformation steps of the algorithm preserve the syntactic correctness of any given configurable business model, as prescribed by earlier researchers, and by running it on different sets of test scenarios to demonstrate its correctness. We developed a tool to apply the Transformation Algorithm and to demonstrate its validity on a set of test cases as well as a real case study that was used by earlier researchers who developed the C-EPC
