The purpose of the book “Digital Capability-Building Lego-Like Capabilities into Core Business Competency “ is to provide an insightful understanding of assessing, developing, and managing organizational capabilities in a structural way. The organization’s competency is based on a set of cohesive capabilities and how fast and effective they can be built upon. The high-mature organizational capability is the digital business differentiator, to keep the business unique, competitive, and innovative, to improve business maturity significantly. The capability views enable dot connections and help the business identify “actuality, capability, and potentiality,” build Lego-like capabilities into core business competency and improve the success rate of strategy execution and overall business maturity.