From Fax Encyclopedicus
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The Initiative skill is used to determine starting placement in combat. It can also be used to negate a sneak attack.
At the start of a battle, each combatant makes an initiative check. Characters act in order, counting down from highest result to lowest. In every round that follows, the characters act in the same order (unless a character takes an action that results in his or her initiative changing).
If two or more combatants have the same initiative check result, the combatants who are tied act in order of total initiative modifier (highest first). If there is still a tie, the tied characters should roll again to determine which one of them goes before the other.
Making an Initiative check requires no action.
You may not try again on an Initiative check to determine your placement in combat.
You can use the Initiative skill to negate a Sneak Attack or prevent being flat-footed.
When being attacked by a precision attack (such as Strafe, Ambush, or Sneak Attack), you may attempt to negate the extra damage as an immediate action with an Initiative check versus a DC of 15 + the total number of extra dice from the precision attack + the attacker's Dexterity modifier. If you are full-attacked, you must choose which attack in the full-attack action to negate, but you must choose which attack to negate before seeing the results of the attack roll.
When you are flat-footed, you may attempt to negate your flat-footed condition against a single attack as an immediate action. Unlike most immediate actions, you can use this ability when flat-footed. The DC to prevent being flat-footed against a single attack is 10 plus the attacker's total Attack Bonus (not their Base Attack Bonus). If you are full-attacked, you must choose which attack in the full-attack action to negate, but you must choose which attack to negate before seeing the results of the attack roll.
Danger Sense is an immediate action. Unlike most immediate actions, you may use it when you are flat-footed, but only to prevent being flat-footed. You may not attempt to prevent a sneak attack when flat-footed.
You may not try again when using Danger Sense.
The Initiative skills is not in any skill set, instead, it is a class skill for Rangers, Rogues, and Warlords. Other classes may put ranks in Initiative as a cross-class skill.