Editing Unwritten: System Reference Document/Playing a Scene (section)

====Determine the Opposition====

The opposition to the action determines how effective a character’s roll is and the results of the action. If someone or something is actively working against the action, then the opposition is active. Otherwise, the opposition is passive. In either case, the type and amount of opposition is determined before the actor rolls.

If a character is the target of an action, that is the actor is trying to do something to the character, then that character is actively opposing the action as long as they are capable of doing so (not unconscious, etc.).

=====Passive Opposition=====

Passive opposition represents the general resistance to an action. It is represented by a static rating. In some cases, the GM may decide that the opposition is coming from an active source, but may consider the source unimportant or uninteresting and just use a passive opposition for brevity’s sake.

=====Active Opposition=====

Active opposition signifies someone or something putting out effort to oppose the action. The opposition gets an Oppose action, which they roll before the actor rolls. Like an actor, they will choose a skill, collect any relevant bonuses from stunts, and add both to their dice roll.