What is the difference between attribution and incrementality?

This is an FAQ article explaining the difference between last-touch attribution and incrementality

Last Touch Attribution, also referred to as last-click, is an attribution model which gives 100% credit to the last ad a user interacted with before conversion. 

Pros & Cons of Last Interaction Attribution

  • Last touch attribution is the easiest to implement and evaluate.
  • Last touch attribution works in real time.
  • The downside is that this model ignores everything that happens before the final touch. The engagement and touch points prior to that last touch will be just as important.
  • This model commonly causes over-attribution and over-crediting paid media for results that would have been organically achieved without paid media activities.

last touch

With recent changes in mobile operating systems and browsers - user level identification is becoming impossible and moving to a more aggregate cohort level. 

While this move makes conversion level matching impossible - the mechanics of this method remain the same where attribution happens based on “last touch” , while the reporting of attributed conversions would be reported in aggregate form rather than a single conversion. 

With user identification being deprecated, marketers who relied on user level tracking and  attribution must adapt to a new reality. Attribution has always been a critical part of Advertising. Even without the user identification, marketers still have ways to attribute advertising activities to sales results. 

Measuring Impact: The Beginner’s Guide to Incrementality


Incrementality measurement a method to understand the true value of Advertising spend.

Incrementality measurement does not assume to replace attribution. Both are used for different purposes. Incrementality measurement relies on whatever you would use as a source of truth as the data to indicate if results generated are

a) incremental

b) valuable

Incrementality attribution can provide insights in granular levels over campaigns, demographics, vendors, geo location, contextual features. These insights can be used in an operational - tactical level.

True Attribution Focuses on Incrementality

Last touch attribution will continue being available on an aggregate level (such as campaign), allowing marketers to use last touch as a proxy for optimization of creative, and engagement.

The deprecation of user identification forced digital marketers to adapt. The good news is that this adaptation can lead to better outcomes. Focusing on incrementality, rather than last touch, will help marketers unlock the full value of their marketing budget.


Not only do we need to move from last touch to multi-touch attribution, but the next step is focusing on incrementality. Even once all the touch points are known, it’s crucial to know which touch points truly drove conversion and which were just noise. This is a very challenging problem to solve, but has begun to garner increased attention. (LUMA Partners, DSM 2019)


Learn more at incrmntal.com