This document discusses how marketing has evolved from a traditional 3-step model to a new model focused on key moments throughout a customer's journey. It outlines stimulus, zero moment of truth (ZMOT), first moment of truth (FMOT), and second moment of truth (SMOT) as important touchpoints. It also emphasizes the growing role of mobile and multiple screens, noting that customers now research and make purchasing decisions across various devices. Checklists and tools are provided to help marketers adapt to these changing customer behaviors.