Growth measurement needs honest boundaries

A useful measurement approach makes those relationships visible instead of claiming every favourable movement.

I use a combination of commercial indicators and customer evidence to evaluate the choices we can influence. Stating attribution limits strengthens the conversation with finance and sales. It also helps the team learn which interventions deserve further investment.

Overclaiming persists because the pressures all point in the same direction. Marketing budgets are scrutinised closely, and the function is asked to justify spend in terms that finance will accept. Advertising platforms report results that tend to credit their own channels. Simple attribution methods assign value to the last interaction before a purchase, which flatters the activities closest to the sale and ignores much of what came before. Faced with all this, it is tempting for a marketing team to present every favourable movement as its own work, and difficult to admit uncertainty.

I use several sources of evidence together and agree with finance in advance which ones will judge each programme. Where it is feasible, we run controlled tests, holding back a comparable audience or region to see what happens without the activity. We use modelling to understand longer patterns that tests cannot capture, and customer research to understand consideration and the reasons behind choices. Each finding is reported with an honest statement of confidence. When methods disagree, we say so and explain what further evidence would resolve the difference.

Imagine a quarter in which revenue rises after a major campaign, but a competitor has also withdrawn from part of the market and prices have changed. Claiming the uplift for the campaign would be easy and might even be believed. A more disciplined approach compares regions or audiences that saw the campaign with those that did not, and asks customers what prompted their purchase. If the campaign contributed less than the headline suggests, the right response is to move budget towards activities with stronger evidence, and to say so openly.

The objection I hear is that rigorous measurement is slow and expensive, and that brand effects build over long periods that tests cannot capture. Both points are valid. Not every activity needs a controlled test, and the most rigorous methods should be reserved for the largest and most uncertain spending choices. Brand investment can be described honestly as a longer-term commitment, supported by leading indicators such as awareness, consideration and preference among the customers we want to win. Being explicit about that distinction is far better than forcing brand work into short-term measures it will inevitably fail.

This asks finance and sales to agree shared definitions of the outcomes that matter, so that marketing is not measured against one view of success while sales is measured against another. It asks the chief executive to accept that some effects will remain uncertain, and to judge the marketing team by the quality of its reasoning as well as its results. Within marketing, it means rewarding colleagues for what they learn, including when a favoured programme turns out to contribute little, rather than for the size of the claims they make.

Honest measurement also earns marketing a different seat at the table. When the function states what it does not know as clearly as what it does, finance and the board treat its recommendations as investment cases rather than advocacy. That credibility is worth more than any single attribution model.