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Visualizing a non-linear funnel with re-entry

Source: interviewintermediate

WHAT IT TESTS: Matching visualization to data shape. OUTLINE: A linear funnel cannot show branching or re-entry; a Sankey diagram encodes flow volume, splits, and leaks as proportional ribbons. RED FLAG: Defaulting to a bar funnel or pie chart.

WHAT IT TESTS: Whether you choose a chart by the structure of the data, not habit. ANSWER OUTLINE: A standard funnel assumes a strictly linear, one-directional path, so it cannot show branching, drop-off to multiple destinations, or re-entry. A Sankey or alluvial diagram fits: nodes are stages and ribbons whose width is proportional to user volume show where flow splits, leaks, and loops back, making the largest drop-off obvious. RED FLAG: Proposing a bar funnel, a pie chart, or a line chart that flattens the multi-path reality.

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Visualizing a non-linear funnel with re-entry · Tezvyn