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This is an article from a series of blog postings. Please do read my "Using Org Mode Features" (UOMF) series page for explanations on articles of this series.
In this article, I give a brief overview on my current habit of using Org mode todo keywords, scheduled dates and org-edna triggers to define the life-cycle of an Org mode heading that is a task at least once.
At the moment, I'm not using deadlines at all. My default todo keyword is NEXT. I once used TODO as an unscheduled task and NEXT as a scheduled one. However, I got rid of TODO altogether and use SOMEDAY for this purpose which better reflects its character.
Most tasks are created with NEXT and a scheduled date and directly go to DONE when solved.
I love to define tasks that are waiting for another task as a normal heading without any todo keyword or scheduled date. When the depending task is finished, this task then gets its keyword (usually NEXT) and a scheduled date (usually today) via org-edna automatically. This way, I don't need recurring reviews in order to move my projects forward.