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In the systems and software modeling field, a conceptual model involvesmodeling with concepts to support development and design. An example of aconceptual model is a description developed using the Unified Modeling Language(UML). UML uses a model multiplicity formulation approach, wherein a number ofmodels are used to represent alternative views. By contrast, a modelsingularity approach uses only a single integrated model. Each of these stylesof modeling has its strengths and weaknesses. This paper introduces a partialsolution to the issue of multiplicity vs. singularity in modeling by adoptingUML use cases and class models into the conceptual thinging machine (TM) model.To apply use cases, we adopt the observation that a use-case diagram is adescription that shows the internal structure of the part of the systemrepresented by the use case in addition to being useful to people outside ofthe system. Additionally, the UML class diagram is recast in TM representation.Accordingly, we develop a TMUML model that embraces the TM specification of theUML class diagram and the internal structure extracted from the UML use case.TMUML modeling introduces some of the advantages that have made UML a popularmodeling language to TM modeling. At the same time, this approach supplies UMLwith partial model singularity. The paper details experimentation with TMUMLusing examples from the literature. Our results indicate that mixing UML withother models could be a viable approach.

TMUML: A Singular TM Model with UML Use Cases and Classes