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There have been a number of philosophical discussions whether functional programming or object-oriented programming is the better programming concept. In reality, programmers utilize both concepts and functional programming concepts improve object-oriented languages. Likewise the modeling of OO languages should also reflect these concepts in the modeling process. This paper improves the modeling of behavior (usually expressed through functional programming) in UML class diagrams. In UML class diagrams, behavior modeling is only achieved by modeling a new class containing the desired function. If several alternatives for a certain behavior have to be expressed, the modeling complexity increases because we need to introduce an interface and for each alternative an additional class. Therefore, we propose a new function element that circumvents these problems and reduces the complexity of the model. Due to the proposed <<Function>> stereotype, functions in the model can be identified at first glance. The new model is motivated by the strategy pattern and evaluated against a more complex design pattern. A possible first implementation is presented.

Function References as First Class Citizens in UML Class Modeling