Today, marketing professionals are being asked to apply principles of psychological influence and behavioral economics to the design of digital channels. If you have studied, read and worked in the field, you may be able to demonstrate proficiency by passing the CDPA exam. This exam assesses the same persuasion engineering tools and research based insights covered by HFI's two courses which teach strategies for Persuasion, Emotion, and Trust (PET): "PET Design" and "PET Architect".