Using communications and information systems that are familiar to users is part of which key principle?

The key principle that emphasizes using communications and information systems that are familiar to users is based on the concepts of reliability, scalability, and portability. Familiarity with systems enhances the reliability of communications during emergency situations, as users are more adept at utilizing these systems effectively.

Scalability refers to the ability of the systems to adapt and support varying demands, which is important during incidents that may escalate. Finally, portability ensures that systems can be used across different platforms and settings, which is crucial when moving between various locations or jurisdictions in a response scenario. By prioritizing these characteristics, organizations can enhance operational efficiency and effectiveness during incidents, ultimately supporting better situational awareness and command decision-making in real-time.