In the upstream oil and gas industry, the greatest risk is not technical failure—it is premature certainty. Drilling Confidence vs Capital Discipline examines a critical but often overlooked problem in early field development: how organizations convert incomplete geological knowledge into irreversible capital decisions. Drawing on nearly two decades of subsurface and development experience, Andi Anriansyah reveals how discovery momentum, appraisal success, and institutional pressure systematically distort decision-making at the exact moment when discipline matters most. This is not a book about engineering techniques or financial modeling. It is a book about the space between them—the translation layer where probability becomes commitment, where narratives override data, and where billions in capital are either protected or destroyed. Through a structured framework of cognitive analysis, governance design, and strategic discipline, the book introduces a new way of thinking about early development decisions: • Why appraisal success can increase risk rather than reduce it • How capital discipline fails long before final investment decisions • Where optionality is lost—and how to preserve it • What separates technical confidence from financial commitment Written for asset leaders, capital committee members, and senior technical professionals, this book provides the conceptual architecture required to navigate uncertainty without surrendering to it. Because in early field development, the most dangerous decision is not being wrong—it is committing before you know what being wrong means.