Field Note · Growth Testing
Performance testing hierarchy
There's a hierarchy to structured performance testing. Getting more from any channel isn't about testing more. It's about testing the right opportunities, in the right sequence, from foundation up.
Most brands start their testing programs with creative. New hooks, new formats, new angles. It feels productive. But it's testing the roof before you've checked the foundation.
Creative testing is critical, but it only works if ads reach the right people. Validating levers that impact ad delivery first, like funnel stage or optimization settings, has an outsized impact on performance and amplifies the results of creative testing.
That's because marketing strategy works as a stack: funnel stage and objectives at the base, optimization and attribution one level up, then bidding, then creative on top. If a lower layer is miscalibrated, creative testing alone won't fix it. You'll find "winners" that win inside a broken system.
Reminder, a “winner” maximizes your total incremental revenue. If meaningful revenue happens offline, through marketplaces like Amazon, or through major retailers, your measurement approach needs to account for that.
The best testing plans work from the bottom up:
Funnel stage: Measure the incrementality of each stage independently. How incremental is your prospecting spend vs. retargeting vs. retention? Validating this layer alone has redirected meaningful budgets for brands that assumed their allocation was sound. Prospecting undervalued, retargeting over-credited.
Optimization and attribution: Are you optimizing for the right conversion event? Value or volume? Are your attribution settings maximizing incremental results? For higher spending brands advertising across multiple channels, multi-cell tests at this layer often surface the biggest gaps between attributed and incremental performance.
Bidding: Cost goals, ROAS goals, bid caps, value rules. These only work correctly if the layers beneath them are sound. Test bidding strategies after your funnel allocation and optimization settings are validated.
Creative: You test creative. With the foundation in place, creative winners are real winners, not artifacts of a miscalibrated system.
You don't have to test these sequentially. Tests with non-overlapping audiences, different markets, or different funnel stages can run concurrently. That's how brands get to 15+ structured experiments per year without 15 separate test windows.
The brands that get this right don't just have better ads. They have a growth system that compounds: better measurement leads to better decisions, better decisions lead to faster, more profitable growth.