Groups comparison
Threat indicator (Detection indicator) - 1998 to 2018
Has some extra HUD or gameplay element that shows the protagonist is in danger even when the player does not know it. Often with several degrees of danger, from NPC suspicion, recognition, search, pursuit, to all out alarm.
Old skool surveillance(Visibly flawed surveillance) - 1999 to 2016
Surveillance system that clearly leaves holes in what they're surveying. Often with security cameras that show their view cones and move about in predictable patterns that leave holes through which the player can slip by.
Has some extra HUD or gameplay element that shows the protagonist is in danger even when the player does not know it. Often with several degrees of danger, from NPC suspicion, recognition, search, pursuit, to all out alarm.
Old skool surveillance(Visibly flawed surveillance) - 1999 to 2016
Surveillance system that clearly leaves holes in what they're surveying. Often with security cameras that show their view cones and move about in predictable patterns that leave holes through which the player can slip by.
indicator-threat
oldskoolsurveillance