Lately, computational thinking (CT) has gained popularity as a universal problem-solving technique and is already part of many school curricula. However, many teachers still struggle with its implementation. Therefore, teachers should be introduced to unplugged activities that can be integrated easily into the familiar teaching environment. Modeling with diagrams as used in computer science (CS) is the ideal solution. To facilitate the implementation of modeling, the Reference Framework for Modeling (ReMo) was developed. With this framework, which is inspired by the Common European Framework of Reference for Languages, educators and learners reflect and classify their models and CT-abilities in categories from A1 to C2. This paper describes the evaluation of the ReMo as an assessment tool and guideline by examining different models created by learners and by analyzing a workshop based on the ReMo. Furthermore, the authors investigate educators' views about the ReMo’s potentials and challenges in an interdisciplinary context.