When formulating assertions, focus on specific, measurable, and actionable claims. For example:
- "Using a [personalized subject line](https://) will increase the open rate by 10%." - "Including a [call to action](https://) button will boost click-through rates by 20%." - "Sending emails on [Tuesdays at 10 AM](https://) will result in higher engagement."
These assertions should be based on historical data, industry benchmarks, or educated guesses about your audience's preferences.