This document discusses how optimizing websites goes beyond usability to incorporate an understanding of psychology and decision making. While usability is still important, decision making is influenced more by subconscious feelings and emotions, resulting in sometimes irrational behaviors. To optimize websites, quantitative and qualitative research methods should be used to understand what influences a target audience. Principles of decision making psychology, like social proof, scarcity, and urgency, can then be incorporated into the design to positively influence decisions when implemented and tested appropriately.