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Case Management Model and Notation (CMMN) was introduced by the Object Management Group as an alternative modeling language, targeting human-centric processes characterized by lack of structure and agility. However, although it is adequately supported by well-known process management tools, CMMN applicability as a modeling language is being questioned in practice. In this work, an empirical evaluation of CMMN models is presented, through a real-world case study where CMMN has been used for the analysis and implementation of a collaborative process by independent groups of process engineers. Their experience is being discussed, based on their modeling perspective. The produced models in the analysis and implementation phase are evaluated, using pre-existing metrics customized for CMMN. Based on the experience of engineers, CMMN applicability is evaluated, highlighting aspects in which its application might be limited, that should be addressed. [ABSTRACT FROM AUTHOR]