A Formalized Zoned Role‑Based Framework for the Analysis, Design, Implementation, Maintenance and Access Control of Integrated Enterprise Systems

Modern enterprise information systems must simultaneously support complex organizational structures, ensure robust security, and remain scalable and maintainable over time. Traditional Role‑Based Access Control (RBAC) models, while effective for permission management, operate primarily as post‑design security layers and do not provide a unified methodology for structuring system architecture. This paper introduces the Zoned Role‑Based (ZRB) model, a mathematically formalized and comprehensive framework that integrates organizational modeling, system design, implementation, access control, and long‑term maintenance. ZRB models an organization as a hierarchy of zones, each containing its own roles, applications, operations, and users, forming a recursive Zone Tree that directly mirrors real organizational semantics. Through formally defined role hierarchies, zone‑scoped permission sets, and inter‑zone inheritance mappings, ZRB provides a context‑aware permission calculus that unifies authentication and authorization across all zones. The paper presents the theoretical foundations of ZRB, a multi‑phase engineering methodology for constructing integrated enterprise systems, and a complete implementation architecture with permission inference, navigation design, administrative subsystems, and deployment models. Empirical evaluations across several deployed systems demonstrate significant improvements in permission accuracy, administrative efficiency, scalability, and maintainability. ZRB thus offers a rigorously defined and practically validated framework for building secure, scalable, and organizationally aligned enterprise information systems.