Version: 2019.4
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Script Execution Order settings

Use the Script Execution Order settings to specify the relative order that Unity invokes the event functions of different MonoBehaviour classes. For example, you can specify that Unity should run the event functions of your Rotation MonoBehaviour script before it runs those of your MoveForward MonoBehaviour script.

The order applies to each category of event function separately, so Unity calls any Awake functions it needs to invoke during a frame in the specified order and, later, calls any Update functions of active GameObjects in the same order.

You can adjust the script execution order in the Project Settings Inspector. Go to menu: Edit > Project Settings, and then select the Script Execution Order category.

Use the Plus (+) button to add scripts to the settings Inspector window and select the class name. To remove a script, use the Minus (-) button located to the right of each item in the list.

To specify the execution order, drag items in the list into the desired position or edit the order numbers of a class in the list. The assigned numbers express the relative order. Unity executes the list from top to bottom (from scripts with more negative order numbers to those with higher positive numbers). Unity executes any scripts not in the list during the Default Time slot, which occurs after any scripts with negative order numbers and before any scripts with positive order numbers.

The order numbers are arbitrary and do not represent any physical quantity. The Editor stores these values in the script metadata files. You can leave gaps between order numbers to help avoid extraneous file changes when you add or move other scripts in the list.

Note: The execution order specified in this settings window does not affect the order of functions marked with the RuntimeInitializeOnLoadMethod attribute. (You cannot specify an order for runtime initialization.)

See Order of Execution for Event Functions for information about when Unity invokes each of the different categories of event functions in a frame.

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