When designing Security many considerations must be applied not only Establish Context, SWAT anlyses (Strength,Weakness,Oportunities and Threats) Risk Management practice, CPTED principles (Crime Prevention Through Environment Desisign) , State and Federal Laws and Statutes, Statistics, OH&S, and relating Standards such as AS/NZ or ISO. One Other consideration that is often left to after implementation is that of procedures and maintenance. When Placing these consideration high on the priority list , ongoing costs such how do we get our video from a DVR , how do we ensure it is backed up, should we install a camera so hard to get to that specialist equipment is required (cherrypicker etc) is access to the equipment available during peak periods, what are the maintenance costs. All these consideration may sway decisions. when comparing the alternatives over the life expectancy or half life (time of major upgrade) of the system it then only will the best decisions be made and with a just decision made ongoing acceptance and support of the system should follow.
Design more than a security installation.