Most marketers are running paid campaigns without visibility into what is actually driving conversions. Here is a measurement framework that separates signal from noise.

The core principle: measure at the customer level, not the campaign level. Track from first touch to revenue, not from impression to conversion. Use multi-touch attribution or a closed-loop tracking system that connects ad spend to actual business outcomes.

Without this, you are spending on vanity metrics — impressions, clicks, CTR — while the actual business question (which campaigns drive revenue) goes unanswered.