Authorization models have evolved from simple role checks to more sophisticated methods like relationship-based access control (ReBAC) and attribute-based access control (ABAC), both of which offer distinct advantages for managing access in complex systems. ReBAC focuses on the relationships between users and resources, making it ideal for systems with dynamic sharing and hierarchical structures, while ABAC relies on evaluating attributes of the user, resource, and environment, making it suitable for scenarios with straightforward attribute-driven rules. Permit.io, using tools like Terraform, enables the modeling and management of these access control paradigms, allowing for seamless transitions between ReBAC, ABAC, and even a hybrid model that incorporates both. ReBAC with Permit.io emphasizes the propagation of access through relationships and inheritance, whereas ABAC with Cedar involves explicit attribute checks. The integration of these models into infrastructure-as-code practices enhances the flexibility and scalability of authorization management, accommodating both complex hierarchical permissions and fine-grained attribute conditions, thereby catering to a wide range of organizational needs.