For lists of tasks, I use my text editor because I can copy/paste/modify as many times as I wish.
For more elaborate process thinking I try to draw stuff with pen and paper but usually, I get frustrated because my drawing skills suck, so I search online for "online diagram sketch" or the like and do my drawings in the first tool that pleases me.
I envy people who can draw and structure things in diagrams using pen and paper.
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