Test Your Skill Test Three | Envelope vs. Self-Mailer Exterior Package Guess which option pulled better, and why: Envelope | Self-Mailer Envelope Self-Mailer Envelope | Self-Mailer   Test Your Skill   Test One | Data Collection How wording affects compliance. Click here for test   Test Two | Envelope Messages Teaser vs. Non-Teaser Click here for test   Test Three | Envelope vs. Self-Mailer Exterior Package Click here for test