You're preparing to launch your next direct mail campaign. You've updated your mailing list and identified your target variables, but what about your messaging? If you've been targeting the same customer base for a while, it's critical to regularly evaluate your approach to prevent things from going stale.

Want to capture your audience's interest and drive purchases? Use psychology! One helpful model is Dr. Robert Cialdini's framework for persuasive marketing. His six concepts—limited availability, mutual exchange, credibility, peer validation, connection, and commitment—can be enormously helpful for improving outcomes and prompting swift customer action.

Design trends change. Fonts change. Even the way people browse catalogs and ads shifts over the years. However, some marketing techniques remain timeless. They strike chords so profoundly rooted in human psychology that they deliver results decade after decade.