Dashboards are interfaces that transform complex data sets into understandable and actionable visual information. A well-designed dashboard presents the right information to decision-makers at the right time. A poorly designed dashboard creates information clutter, slowing down or misdirecting decisions.
Dashboard Design Principles
1. Information Hierarchy
The most important metrics should be in the most visible position. The top-left corner is the starting point of eye tracking, and the most critical KPIs should be placed there.
2. Glancability
A dashboard should be able to communicate the overall status within 5 seconds. Details should be presented through drill-down interactions.
3. Data-Ink Ratio
Edward Tufte’s principle: Maximize the ratio of ink used to represent data to total ink. Remove unnecessary decorations, background lines, and ornamental elements.
Choosing the Right Chart Type
| Data Type | Suitable Chart | Avoid |
|---|---|---|
| Time series | Line chart, area chart | Pie chart |
| Comparison | Bar chart (horizontal/vertical) | 3D chart |
| Proportion/Share | Pie/donut (max 5 slices) | Bar chart |
| Correlation | Scatter plot, bubble chart | Line chart |
| Single metric | KPI card, gauge, sparkline | Complex chart |
Dashboard Layout Strategies
- KPI cards: 3-5 key metrics in the top row (number + trend arrow + percentage change)
- Main chart: The most important trend or comparison in the center
- Detail panel: Tables and detailed charts at the bottom or side
- Filters: Date range and segment filters at the top or side
Color Usage
In dashboards, color should carry information, not serve as decoration:
- Green = positive/increase, Red = negative/decrease (keep consistent)
- Use a maximum of 5-7 colors (consider color-blind accessibility)
- Use neutral tones for backgrounds and secondary elements
- Reserve semantic colors for data categories
Time a good dashboard should take to communicate overall status
Source: Stephen Few, Information Dashboard Design
Conclusion
Dashboard design is where data science meets visual design. A dashboard that enables users to make fast and accurate decisions directly improves business performance. The TAGUM team designs custom dashboard and data visualization solutions for your business.
