A Design Pattern Language to Assist the Design of Alarm Visualizations for Operating Control Systems
A set of incoming alarms has been registered. The human operator would like to compare the number of alarms across different dimensions such as priority, typology or time.
The human operator needs to compare the number of alarm activations across alarm dimensions.
Use bar charts to represent absolute magnitudes of alarm activations. A bar chart is graphic figure in which numeric quantities are represented by the linear extent of parallel lines or bars, either horizontally or vertically. They can theoretically consist only a single data item, but in most cases are used to additionally compare the quantitative value of several entities with each other. All data items are measure on the same scale.
Bar charts are, besides pie charts the most common data visualization technique and find wide usage in popular statistics . They are useful to compare several quantitative entitles of a common class. (Card, S. K., Mackinlay, J. D., & Shneiderman, B. (1999). Readings in information visualization: Using vision to think Morgan Kaufmann Pub. )