4.9
Purchase Funnel / AIDA
The model that buyers pass in sequence through attention, interest, desire and action, with the population narrowing at each step.
Attributed to E. St. Elmo Lewis (c. 1898); named and popularised via Edward Strong (1925)
What it does
Organises an organisation. It gives every activity a place, every team a stage to own, and every budget line a story about what it is for. That coordination value is real and is why the funnel has outlived a century of contrary evidence — it is a management structure that happens to be phrased as a theory of buying.
When it breaks
It breaks as a description of behaviour, which is the thing it claims to be. No empirical work has established that buyers move through these stages in sequence; measurement finds interrupted, non-linear, re-entered paths, and finds that most category buyers are in no stage at all at any given time. Treating it as real produces the characteristic errors: chasing “interest” as if it converts downward on a schedule, and building stage-gated budgets for a population that does not queue.
Case
A 2025 analysis of the AIDA model and conversion-funnel theory traces the framework from Lewis's 1898 formulation through its modern digital descendants and finds that, despite universal adoption in scholarship and practice, its linear sequential claim has never been empirically validated as a description of real purchasing paths.
Analysis of the AIDA Model and Conversion Funnel Theory in Modern Marketing ↗Diagram — not yet drawn
The clean funnel on the left; on the right the same buyers' actual paths drawn as tangled lines that skip stages, reverse, and leave — plus the large block of buyers who never entered the funnel at all, drawn outside it and to scale.
In the wild
Unvetted · not part of the tier assessment
What has been written about this tool in the last twelve months. Machine-retrieved and unchecked — everything above this line was checked.
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