The key to snap judgments is reducing extraneous variables. ‘Thin slicing’ identifies the critical factors and draws on experienced evaluation of them. Many such evaluations are in fact subconscious; both asking people to articulate the process and introducing additional information reduces efficiency and accuracy. Drawing heavily on neuroscience, the book explore the right conditions for spontaneous decision making, unconscious prejudice, and how facial expressions betray thoughts. ‘Take charge of the first two seconds’.