Legend Guidelines

Legends give context to various numerical or textual value. They help users to get a high-level overview of the success of specific intentions.

Structure

1. Name of the notion
2. Value of the notion
3. Supplementary explanation
4. Supplementary explanation value

Best practices

Legends should:

• Be used to outsource information from the plot area of the chart to explain all the displayed visual elements.
• Be used to give standalone information about the exact value of a variable.
• Be used as to guide users through more complex visualizations, so they don’t have to only rely on their visual perception.
• Use appropriate color to the context (of the page) and it's meaning.

Content guidelines

Types:

1. Total numeric value: the outcome is a natural number
2. Percentage value: the outcome is a rate number. In some cases it is essential to provide the original number from which the percentage is calculated.
3. Textual value: the outcome is a string.
4. Hybrid value: the mixture of the options mentioned above.