Most businesses measure marketing effectiveness using last-click attribution: whichever channel the customer interacted with immediately before converting gets 100% of the credit. The channel that introduced them to the brand, the content that built their trust over three months, the email that reinforced their interest — these receive nothing.

Last-click attribution is not wrong — it correctly identifies the final touchpoint in the conversion journey. The problem is treating the final touchpoint as the only touchpoint that matters.

First-touch attribution gives 100% of the credit to the channel through which the customer first discovered the brand. Useful for understanding which channels are best at generating awareness. Ignores the conversion influence of everything that came after first discovery.

Last-touch attribution gives 100% of the credit to the final interaction before conversion. Useful for understanding which channels close customers. Ignores the awareness and consideration stage influences that made the conversion possible.

Multi-touch attribution distributes credit across all the touchpoints in the conversion journey, in proportion to their estimated contribution. More accurate than either single-touch model. Requires more data and more sophisticated tooling to implement.

Full multi-touch attribution modelling requires data infrastructure that most small businesses do not have. The practical middle path uses a combination of simpler methods to build a more accurate picture than last-click alone provides.

Ask every new customer: "How did you first hear about us?" The response rate from this simple question, over time, provides first-touch attribution data that is often dramatically different from last-touch data.

Track branded search volume as a proxy for awareness channel effectiveness. When TikTok spending increases and branded search increases correspondingly, TikTok is generating awareness that converts through search.

Monitor email open and click engagement for subscribers who eventually become customers, compared to those who do not. This identifies which content and email sequences influence conversion, rather than which final channel closed it.

The gap between first-touch and last-touch attribution is where the most valuable marketing insight lives. A channel with high first-touch attribution and low last-touch attribution is an awareness generator that is undervalued by conversion-focused measurement. A channel with low first-touch and high last-touch is a conversion closer that may be overdependent on other channels generating the awareness it converts.

Last-click attribution is cheap to measure and systematically misleading. Building even a partial multi-touch picture — through customer surveys, search volume tracking, and engagement analysis — produces marketing decisions that are substantially better calibrated to where business actually comes from.