David Vincent said this quote

“ Since the 1970s, there has been a continual tendency to over-estimate the surveillance capacities of new technologies. In the sense of the physical invasion of privacy, surveillance comprises five sequential events: the capacity to observe; the act of observation; comprehension of what is seen; intervention on the basis of that knowledge; and a consequent change of behaviour by the subject. Too often the final four have been assumed from the possibility of the first. ”