This paper focusses on the question when and to what extent a particular system component can be considered suitable to use in the context of the dynamics of a larger technical system. We introduce different notions of suitability that arise naturally in the context of probabilistic nondeterministic systems that interact through the exchange of messages in the style of input-output automata. Besides discussing algorithmic aspects for an analysis following our notions of suitability, we demonstrate practical usability of our concepts by means of experiments on a concrete use case.