Determine and Optimize the Operational Characteristics of the Visualization System
Operational characteristics
- Accurate – Prioritize data accuracy, clarity, and integrity, presenting information in a way that doesn’t distort it.
- Helpful – Help users navigate data with context and affordances that emphasize exploration and comparison.
- Scalable – Adapt visualizations for different device sizes, while anticipating user needs on data depth, complexity, and modality.
Color
Color can be used to differentiate chart data in four primary ways:
- Distinguishing categories from one another
- Representing quantity
- Highlighting specific data
- Expressing meaning
Lines
Lines can be applied to specific elements, including:
- Annotations
- Forecasting elements
- Comparative tools
- Confidence intervals
- Anomalies
Text
Text can be used to label different chart elements, including:
- Chart titles
- Data labels
- Axis labels
- Legend
| Type of chart | Usage | Baseline value * | Quantity of time series | Data type |
| Line chart | To express minor variations in data | Any value | Any time series (works well for charts with 8 or more time series) | Continuous |
| Bar chart | To express larger variations in data, how individual data points relate to a whole, comparisons, and ranking | Zero | 4 or fewer | Discrete or categorical |
| Area chart | To summarize relationships between datasets, how individual data points relate to a whole | Zero (when there’s more than one series) | 8 or fewer | Continuous |
* The baseline value is the starting value on the y-axis.
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