What are the two end results discussed in the assigned reading of an effective surveillance system?

What are the two end results discussed in the assigned reading of an effective surveillance system? From both an external and internal perspective, what security measures are needed to accomplish these results and what issues serve as impediments concerning these security-related efforts?Assigned Reading:———————–Fischer, R., Halibozek, E., & Walters, D. (2012). Introduction to security. Oxford: Butterworth-Heinemann.Physical Security Management Protocol. (2014). Protective Security Requirements. Retrieved from https://protectivesecurity.govt.nz/home/physical-security-management-protocol/physical-security-management-protocol-2/#scalable-security-to-meet-increases-in-threat-levels