I think what is really interesting about Boyd's formulation is that you can also use it as a diagnostic tool if you're having problems. There are various pathologies that appear if you drop one of the letters of OODA and still try to make work out of it. A lot of small startups get stuck in DA loops: they fail to come out for air every once in a while to Observe what is going on in the world and Orient themselves to that situation. A lot of big corporations get stuck in OO loops: they spend tons on meetings, on status reports, on market analysis, but decisions never get made and nobody has the authority to take any action.
By studying each of the pieces, how well you are doing in each, and how streamlined they are, you get a very good idea of how well you are executing work.
It's also very interesting that OODA is a fractal strategy. You have OODA loops inside of OODA loops. You can have a yearly OODA loop (project) with monthly OODA loops inside of it (sprints), and daily OODA loops inside of that (stand-ups and day-to-day operations).