Why A-B-C priorities don’t work in “to-do” lists

I was just coaching someone who was unfamiliar with GTD and he was convinced that prioritizing tasks with an A-B-C priority was the best way to determine what was the most important task to do first. I have tried this and it does not work.

A-B-C priority codes don’t work

Similarly, listing the top dozen things you need to do in order 1-12, doesn’t work either.

There are several reasons for this. The reality is our priorities change over time. You’ll have a different priority set at 9:00 tonight than you will at 9:00 this morning. This is especially true when you acknowledge the reality that over the course of the day “stuff happens” and you can easily become “overtaken by events” that are unplanned and just happen to us.

Additionally, there is also the wasted time of scanning your tasks to see if they need to be re-prioritized or re-written. This wasted energy will eventually repel you to your system and you will stop using it. On a day-to-day, moment-to-moment basis, there is no algorithm or formula that is sustainable in some written or coded system.

The only way to effectively prioritize the stuff you have to do is to break down your to-dos down into the very next action necessary to achieve completion of the overall goal or task. Then this next action needs to be parked in the appropriate context – what can you do where you physically are.

Then once you have determined the next action and context, they become actionable and you are ready to act on your tasks.

What criteria do you use to decide what to do?