What is a difference between rule-based and role-based access control mechanisms?

Rule-based are simple and easy to execute, and role-based are well-defined.

Role-based are an appropriate choice in geographically diverse workgroups, and rule-based are for simply structured workgroups.

Rule-based are less granular, and role-based have time constraints.

Role-based are efficient in small workgroups, and rule-based are preferred in time-defined workgroups.