the lean startup process is built around three pillars. The first pillar is the business model canvas (described in Chapter 2), used as a planning template. The second pillar is the customer development process used for value discovery and validation. A central tenet of this approach is the “getting out of the building” philosophy (talking to external experts and customers), which is critical to gathering information and testing product-market fit. The third pillar is that agile is the development philosophy.
