In order to efficiently execute a risk response action plan, it is most important for the emergency response team members to understand their defined roles and responsibilities. This can help to ensure that the team members know what they are expected to do, how they should coordinate and communicate with each other, and how they should report the progress and outcome of therisk response. The system architecture in target areas, IT management policies and procedures, and business objectives of the organization are other important factors, but they arenot as important as the defined roles and responsibilities. References = ISACA Certified in Risk and Information Systems Control (CRISC) Certification Exam Question and Answers, question 12; CRISC Review Manual, 6th Edition, page 215.