The use case involves the development of SewGuide digital sewing machines to train workers and preserve process knowledge in the manufacturing process of PPE for firefighters. These machines enable beginners to gain experience through a digital learning application that incorporates live data from the machine to provide feedback. The goal is to sustainably replenish experts in the industry and train new professionals while preserving existing craft and process knowledge using digital solutions. This helps to combat the diminishing number of experts in Germany, where the craft has historically been outsourced, and to adapt to changing products and safety requirements at international sites. the SewGuide use case especially contributes to the measurement of human-centricity by evaluating the acceptance and effectiveness of the digital assistant in the learning process.