Very simply, I don't understand the difference. I'm versed in GTD jargon, but don't understand Action vs. Next Action. There's a seperate option for it on all GTDGmail labels. Is "Next Actions" for project actions and "Actions" for just general project-unrelated actions. So

Action
Call Sara for Dinner.

Project -- Decide Budget
Next Action -- Call Tim from Accounting

So Calling sara, is unrelated to a project so it's just an Action?
And Calling tim is project-related (to the project "Decide budget"), so it's a "next action"?

Please help clarify this ambiguity. Thanks