How to compare marketing performance before and after a change
https://brandlyup.com/insights/how-to-compare-marketing-performance-before-and-after-a-change/

QUICK ANSWER
A before-and-after comparison should use compatible definitions, time windows and audiences while recording other changes that could affect the result. It can show an association, but rarely proves that one change alone caused the outcome. Interpret the evidence at the strength it supports.

WORKING CHECKLIST
1. Record the change and concurrent factors.
2. Keep metric definitions consistent.
3. Use comparable observation periods.
4. Include counts and alternative explanations.

YOUR BRIEF
Business / website:
What needs to change:
Existing materials:
Open questions:
Timing:

SCOPE
AI-assisted practical guide. Examples are illustrative; business-specific facts and sector claims need the responsible owner’s approval.

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