“…However, there are no specific instructions guiding designers through the design process to identify the usability aspects relevant to the perceived usability of their products and in setting up a study to evaluate these usability aspects [12]. Besides, several studies exist, which analyze certain usability aspects, such as the ergonomics of different tool handles, vibration comfort, or ease of use, to optimize a product [2,[13][14][15][16][17][18][19][20]. All of these studies are individually designed to analyze a defined usability aspect of a product.…”