This document discusses design thinking and provides an overview of its methodology. It introduces IDEO as an iconic example of design thinking and discusses its founder David Kelley. The core principles of design thinking are then outlined, including understanding the problem, observing and researching, generating ideas through prototyping and testing, getting feedback, and implementing solutions. An example is provided of how not applying design thinking caused water filters to fail in the field, despite removing pathogens in the laboratory. Participants are then asked to redesign a street taco stand using design thinking principles.