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Harvard psychologist Teresa Amabile asked more than two hundred professionals to keep a short diary of every workday. She gathered nearly twelve thousand entries and looked for what set the good days apart from the bad ones. It wasn't praise, or incentives, or deadline pressure. The dominant pattern was something else: on the best days, the person had moved forward on something that mattered to them. Even by a small step. She called it «the progress principle».
The trouble is that our tools are designed to hide that progress. A to-do list is an inventory of what you haven't done yet: you can cross off six things and still end the day staring at the four that remain.
The application is almost absurdly simple: alongside the to-do list, keep a done list. Two minutes at the end of the day to note what moved forward, even if it's «I worked out what doesn't work». Amabile found that recording those small wins feeds precisely the circuit that keeps you going.
It isn't self-deception: it's honest accounting. If you only look at what's missing, your whole week reads like debt. And it almost never is.