What do communication rules in ISO 27001 define?

Communication rules in ISO 27001 are fundamentally about establishing a clear framework for how information is shared within the organization. They define the content, form, audience, and process of communication concerning the Information Security Management System (ISMS). This means that organizations must determine what information needs to be communicated about security measures, how that information should be presented (such as through reports or discussions), who the intended audience is (such as staff, management, or external stakeholders), and the processes by which this communication will occur.

Essentially, effective communication is critical to the success of an ISMS because it ensures that all stakeholders are informed, aware, and engaged with security policies and procedures. By clearly defining communication rules, an organization can promote a culture of security, facilitate the sharing of relevant information, and ensure that everyone understands their role in maintaining information security.

The other options, while they may pertain to different aspects of ISO 27001 or organizational management practices, do not specifically relate to the comprehensive delineation of communication within the framework of the standard.