Why it's important to keep your system current

No matter how consistent the system is, if it is not current (i.e. completely up to date with all items in a category) it still can’t be trusted in a way that relieves the psyche of the job of remembering and sorting. You’ll look at a list and some part of you knows it’s not the whole list, so (a) you won’t totally trust your choices and (b) you’ll still try to use your head to keep track. And if your brain still has that job, instead of trusting your lists, you won’t be motivated to keep your external system going (it will be too much work for the value received.) You’ll feel like it’s hard work to keep the list and will resist looking at it anyway because you’ll know it’s only partial and it will remind you that you’re “behind.” – David Allen