A plan that survives Wednesday
Most weekly plans die by midweek. Usually not from laziness — from living in four places at once.
A plan falls apart on Wednesday for a dull reason: by then it exists in four places. Two things are in your head, one in a chat with yourself, one on a sticky note, and the calendar holds only the meetings someone else set.
None of those four is wrong. The problem is that checking all four costs more than doing the smallest task on them.
The test that tells you it is happening
At the end of the day, ask: could you say what tomorrow holds without opening anything? If the answer needs a search, the plan is not a plan yet — it is material for one.
What actually fixes it
One place, and it has to be the boring one. Not the prettiest app — the one you already open for another reason. A plan you have to visit is a plan you will stop visiting.
Then two rules. Everything with a date goes in with its date, even if the date is wrong. And anything that takes under two minutes never gets written down at all — writing it costs more than doing it.
Where it helps to have a space
If you keep a space here, the day already holds what is known about it: what is due, what you spent, what arrived. The plan stops being a separate thing you maintain and becomes the day you are already looking at.