How can I A/B test personalization strategies?

Testing personalization requires comparing different personalization approaches systematically:

Personalized vs non-personalized: The baseline test. Does adding the recipient's name, location, or behavior actually improve performance?

Personalization types: Name personalization vs behavioral personalization vs preference-based personalization. Different types work differently for different audiences.

Personalization depth: Light personalization (name only) vs deep personalization (product recommendations, dynamic content blocks). More is not always better.

Personalization placement: Subject line vs body vs both. Where personalization appears affects its impact.

Fallback testing: What happens when personalization data is missing? Test your fallback strategy.

Personalization is a spectrum, not a switch. Test to find where on that spectrum your audience responds best.