Sankey diagram

Alternative name:

Sankey key

This is a flow diagram where the width of the arrows reflects their magnitude or quantity. It's used to show the flow of data between different stages or categories, and the arrows or lines can come together or split apart at each stage of a process.

Tips for use and when NOT to use

Unlike parallel sets, a sankey diagram can include cycles and flow paths can combine or split at any stage. You can use arrows to show the direction of flow. Limit the number of nodes and flows to avoid cluttering the diagram and making it difficult to interpret. Use a clear colour scheme to differentiate between categories and label each flow with its value.

Use case / Examples

1. To visualise the flow of investment capital between different industries or sectors, showing the relative amounts invested in each area.
2. To visualise the movement of talent within and between different industries over time.

Question example:

Over the past five years, have you changed industries? If so, which industries did you move from and to?

Recommended Survey Question Types:

Numerical response, Single mention

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