Process-Oriented Programming (POP) is a workflow-centric architectural paradigm designed to enhance transparency, controllability, and maintainability in modern software systems. Unlike object-oriented or event-driven models—which often obscure execution flow and distribute state—POP organizes computation into explicit process steps that operate on a structured, centrally managed context. This whitepaper introduces the motivation, conceptual foundations, and formal structure of POP. We argue that POP serves as a superior architecture for complex domains like AI, robotics, and automation, particularly in environments where human developers and AI coding assistants must collaborate effectively. By enforcing explicit data contracts and providing auditable state transformations, POP aims to reduce cognitive load, prevent uncontrolled state mutation, and establish a robust foundation for building reliable, long-lifecycle systems.