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To facilitate model-driven development in practice, we need tools that support and empower developers. Many of the tools for it, however, are somewhat lacking with respect to usability, which can act as a major obstacle in adopting a model-driven approach and impede productivity. Efforts to find concrete usability flaws in model-driven tools are still relatively rare, and in the human computer interaction community, usability for highly specialized expert software is also not a prominent topic. In this work we conduct an evaluation using a number of usability evaluations methods on the 4diac IDE as an example of a model-driven engineering tool to see what works and where the problems are. With those different methods we found a considerable number of usability issues of varying severity as well as some indication which methods work in what context. These findings of course help improving the 4diac IDE …