You can make Intimidate keyed to any ability, depending on what you are doing.
You can change an NPC's behavior with a successful check. Your Intimidate check is opposed by the target’s modified level check (1d20 + character level or Hit Dice + target’s modifiers on saves against fear).
If you fail the check by 5 or more, the target provides you with incorrect or useless information, or otherwise frustrates your efforts.
You can also use Intimidate to weaken an opponent’s resolve in combat. To do so, make an Intimidate check with DC of 10 + target's character level or Hit Dice + target's modifiers on saves against fear. If you win, the target becomes shaken for 1 round. A shaken character takes a -2 penalty on attack rolls, ability checks, and saving throws. You can intimidate only an opponent that can see you.
Varies. Changing another’s behavior requires 1 minute of interaction. Intimidating an opponent in combat is a standard action.
Optional, but not recommended because retries usually do not work. Even if the initial check succeeds, the other character can be intimidated only so far, and a retry doesn’t help. If the initial check fails, the other character has probably become more firmly resolved to resist the intimidator, and a retry is futile.
You gain a +4 bonus on your Intimidate check for every size category that you are larger than your target. Conversely, you take a -4 penalty on your Intimidate check for every size category that you are smaller than your target.
A character immune to fear can’t be intimidated, nor can nonintelligent creatures.
If you have 5 or more ranks in Deception, you get a +2 bonus on Intimidate checks.