Design principles

摘要

Based on our industry practice, and LSD research, we propose the following design principles as applied for the Halden Reactor LSD: 1. Design for fast visual perception. Create visual patterns from process values and alarm limits. Qualitative indicators based on part-wise mathematical normalization are suitable. Reduce masking problems by limiting number of different display objects. 2. Design for limited visual memory. Avoid keyhole problems through a flat display layout rather than display hierarchy. Explicitly show target values, alarm information, rate-of-change cues and automation data. 3. Visualize a plant's dynamic response through qualitative trended indicators; focus on dynamic data through high data/ink ratio (display as little ornament as possible around data; with clever design the real data itself provides the necessary context).