Well, according to David Allen (p. 122) in GTD process as follows:
- Process the top item first
- Process one item at a time
- Never put anything back into “in”
So these means if you have a piece of junk mail on top of a note from the CEO to you, process the junk mail first.
Refer to the diagram in the GTD section of the blog for what the process flow, because there are further categorization that you must follow, if for example the action will take you more then 2 minutes, it’s a multi-step project, etc