scenario. A description of a sequence of events that might possibly occur in the future. A scenario is normally developed by: (1) studying the facts of a situation, (2) selecting something that might happen, and (3) imagining the various ways for that development to occur and the sequence of events that might follow. For example, a person charged with protecting a city might first seek to identify the various threats that might occur and what responses the city’s agencies might make; he could then get ideas about specific challenges to the city’s current security system. In this way, the scenario writer can try to identify potential weaknesses in a city’s security system and suggest ways to improve them.