Interaction Designers are the shapers of behavior. Interaction Designers – whether practicing as Usability Engineers, Visual Interface Designers, or Information Architects – all attempt to understand and shape human behavior. The importance of this profession in business, government, healthcare and society has never been greater, as technological complexity has permeated nearly every aspect of our culture. Thoughts on Interaction Design gives individuals engaged in this profession the dialogue to begin to justify their work to other stakeholders. It provides a framework upon which to build intellectual discourse, and it substantiates the rigorous and unique nature of Interaction Design work. Ultimately, the text exists to better define the professional and theoretical nature of Interaction Design: to provide a definition that encompasses the intellectual facets of the field, the conceptual underpinnings of Interaction Design as a legitimate human-centered field, and the particular methods used by practitioners in their day to day experiences.