## 4 Results
### Results of Expert Interviews
#### Industry 4.0.1 Production  
From the interviews, it became clear--as it does from the international literature--that Industry 4.0 exerts its greatest impact on production, and that the companies surveyed have also developed varied methods and procedures. These can be termed first category when sensors are built into a machine, and sensors are incorporated into the process of monitoring a production process and indicating deviations from it. The V2 example shows how a company incorporates a sensor in the injection molding machine which indicates if the tool needs to be replaced soon, and so the new tool should be prepared by a worker. It also indicates if something stops production. It then sends a notification to the operator's mobile telephone that an intervention is required. On reaching the scene, the worker observes the machine's performance and the perceived problem on the monitor mounted on the machine. If the solution is known, the worker can intervene and restore the production process. If the problem cannot be solved, the supervisor is informed (V2 interview): \"to do this we need clear escalation routes and protocols\" (V2 interview). A similar system was reported in the V3 interview, where the sensor installed in the assembly station can track the worker's work speed, and if it detects a pause, reports this to the worker responsible for intervening. If it does not detect an intervention within a certain time it will notify the next level of the chain. Thus, it becomes clear that something has held up the production process and a solution can be found within a short time (V3 interview). Sensors can be used to maintain the condition of the production line. The Czech brother firm of the V4 interviewee monitors a tool with the help of sensors. If the tool gets dirty, it may require a month to repair. The vibration-sensing sensor notifies the maintenance staff of the slightest deviation, so that the dirt can be removed before the tool is damaged. With this assistance, they have saved thousands of Euros because they have not had to buy new tools, and the old ones have not been taken out of production; in this way, unplanned maintenance has fallen by 12% (V4 interview). The second level and category of digitalization of production processes occurs when machines are a coherent network, as, for example, in an easy-to-adapt, flexible manufacturing system (FMS). A member of the V4 Group's international group of companies is working on a rapidly networking, flexibly configurable line of machines. If the production so requires, a new machine is inserted into the production line. The machine also connects to the network--without the need to reprogram the machine--and thanks to the rapid transfer of data, the production program runs on it and production can continue (V4 interview): \"We call this a Plug and Produce system\" (V4 interview). The third level is support for production in an expanded sense. During the production process, one of the interviewees cited the use of augmented reality as an example of support for quality assurance. The French member of V4's group of international companies uses ActiveGlass in quality assurance. There are steps in the production process that must be carried out in a specific order. Previously, checklists were used, whereas now the glasses are used. The lists are compiled and saved on a computer and connected to the glasses. At the beginning of the work, a small video (with sound and image) shows the wearer what work phase is next, and when and how it will occur. He/she can point to a QR code, and nod or press the button when he/she has completed the task. Meanwhile, both hands are free to work. Where glasses are used, the time required for quality control falls by half, and the error rate decreases significantly. The glasses are manufactured by an external supplier to the group, but the software is self-developed (V4 interview).