This is especially important in industrial settings. If a machine operator makes a mistake it's not just expensive, it can cost lifes. There where instances whe

This is especially important in industrial settings. If a machine operator makes a mistake it's not just expensive, it can cost lifes. There where instances where operators actively fed fuel into fires because they misunderstood the situation displayed on the HMI. Some time ago I found a really nice presentation about the ISA 101 standard covering this topic. The basic idea is: The HMI looks boring everthing is okay, if something goes into a dangerous direction colors and other elements are used to draw your attention.