To measure the complexity of the technical product interface literature provides no methodology. This contribution starts with an overview of the state of the art and a categorized summary of the most relevant literature regarding product-related complexity. A methodical approach is presented for measuring human-machine-interface (short: HMI) - complexity including the product complexity and the degree of automation. For both HMI complexity and product complexity, a parameterization is used to obtain a measurable value. With the help of this parameterization a relationship between these three variables could be established. The degree of automation as a variable is used in the form of a balancing buffer to compensate border crossings depending the HMI complexity as well as the product complexity. These borders are individually marked of the respective product in combination with the user group. A brief evaluation of the methodology on the basis of different example products is carried out.
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