Capability-Driven Development (CDD) is a design methodology for building responsible human–AI systems. Rather than beginning with technology, CDD starts with capability intent: the human and organisational capabilities that systems should support or preserve. The method provides structured approaches for defining human–AI boundaries, documenting governance mechanisms, anticipating ethical and operational risks, and evaluating systems over time. This book introduces the CDD method and the associated design artefacts that help organisations design, evaluate, and govern AI-enabled systems responsibly. The accompanying repository provides evolving templates, patterns, and examples for implementing the methodology in practice. Repository:https://github.com/cloudpedagogy/capability-driven-development