I read David Allen's book in 2002 and immediately started implementing it. At first it felt like godsend. Capturing every "open loop" (everything that is not the way it should be = everything with a delta between current and desired state) and deciding for each of them if there is any action that I need to take and if so, what the very next step was - that practice alone released a ton of energy and gave me a sense o…
As much as I dislike overhyped "lean" in software, in the TPS spirit I think it's a great way to prioritize and avoid planning waste.
With GTD I found I spend too much time writing task lists that would become outdated soon. WIP limits bring focus.