A 'Can Do' not a 'To Do' list.
Reading recently, I came across this and it resonated with me:
"To Do lists are not lists of things to do. They are lists of things you can do." (from 'The Blank Screen' by William Gallagher)
Too often I have put things on to my 'To Do' list that I actually can't do. This is because I am waiting on someone, or do not have all the information I need, or don't have the tools to do it, and so on.
These 'Can't Dos' clog up my day and forever carry over, making my 'To Do' list get depressingly longer and longer. I now get rid of them. I am never going to able to do them. I shunt them to a 'someday' file which I periodically review. They could become a 'Can Do', but more often than not they simply disappear.