How do you design an effective HMI screen hierarchy?

HMI hierarchy design (ISA-101 principles): Level 1 - Overview/area summary showing entire process at glance, alarm status, key parameters. Level 2 - Unit/section displays with major equipment, control loops, and operational graphics. Level 3 - Detail displays for individual equipment, motor controls, valve faceplates. Level 4 - Diagnostic and configuration screens. Navigation should be consistent and intuitive with 3-click rule (reach any screen in 3 clicks). Include consistent alarm banner, navigation buttons, and user login status. Test with actual operators for usability.