Editing Scratch:Basic Rules (section)

===Turns===

Each person controlling characters has an ''initiative group''. This group contains the characters that person controls.
Initiative groups take ''turns'' during ''encounters''. At the beginning of each encounter, roll a twenty-sided die for each initiative group to determine the order of their turns. This is the group's ''initiative'' roll. Groups take turns in order from the highest initiative to the lowest. If two groups have the same initiative, break the tie by rolling another die for both groups until one of them rolls higher. That group goes before the other.
Each character has a turn during each turn of their initiative group. The player controlling the group chooses the order of the turns of the characters in the group.

''Regular actions'' require a character's full attention, so characters can only perform one regular action per turn. Most actions are regular actions.

''Bonus actions'' do not require a character's full attention, so characters can perform one bonus action in addition to their regular action each turn. Bonus actions include opening a door, pushing a button or handing an item to another character.

''Unrepeatable'' actions can only be used once per encounter. For example suppose that a sherriff and an outlaw are stalking each other. Both characters can use the unrepeatable surprise action. Both characters can surprise each other, but the sheriff can only surprise the outlaw one time and the outlaw can only surprise the sheriff one time.