This chapter discusses various aspects of the physical protection system (PPS). Once a PPS is designed or characterized, it must be analyzed and evaluated to ensure that it meets the physical protection objectives. The PPS design must allow the combination of protection elements working together to assure protection rather than regarding each feature separately. Implementation of the PPS design addresses the systematic and integrated protection of assets in anticipation of adversary attacks, rather than in reaction to attacks after they occur. PPS system performs better if detection is as far from the target as possible and delays are near the target. In addition, there is close association between detection and assessment. The ultimate objective of a PPS is to prevent the accomplishment of overt or covert malevolent actions and these objectives are accomplished by either deterrence or a combination of detection, delay, and response. Delay is the slowing down of adversary progress and it can be accomplished by people, barriers, locks, and activated delays. The relationship of PPS functions is also elaborated in the chapter.
