1) Persuasion, emotion, and trust (PET design) are important for building deeper relationships with customers beyond just usability. PET design understands what triggers purchase decisions.
2) E-commerce sites need to go beyond usability and navigation to provide an engaging user experience that makes customers feel committed. Several persuasive techniques can be used, but the key is understanding the emotional triggers of the target audience.
3) Seven principles of PET design are discussed: understanding what customers can do, will do, and still do on a site; reciprocity; scarcity; gravitating toward middle options; sensitivity to food, sex, danger and offspring; small wins; and social validation. These principles leverage human psychology