People underestimate how long their own tasks take

The idea is that you know your own work best. You have done it before, so your guess should be good.

When a task runs over, the reason seems to be bad luck. Something came up that nobody could have seen.

The paper reports several studies. People predicted when they would finish tasks, some for school and some not.

Some people thought out loud while they made their guess. That let the researchers hear what the guess was built on.

In one study, people guessed how long other people's tasks would take.

The paper calls this the planning fallacy: guessing too little time for your own tasks. People's guesses for their own tasks were too hopeful.

While guessing, people thought mostly about how the task would go this time. They leaned little on how past tasks went.

They also explained away past overruns. They blamed causes outside themselves, short-lived and tied to that one time.

Guessing for someone else went the other way. Observers gave others too much time, and used past tasks more.

When people were told to connect past tasks to their guess, the too-hopeful guessing went away.

The abstract does not give how many people took part, or how far off the guesses were. So this page does not either.

The tasks were school tasks and other tasks from daily life, not long projects at work. The paper did not test The Archivist Method.

A short guess sets up a late night and a rushed finish. Then the overrun gets blamed on bad luck, and the next plan starts fresh.

Behavioral Interception is the practice of catching an automatic pattern as it begins, intercepting its usual response, and practicing a different action until it becomes more natural.

Start with the body signal, the first physical sign as you write down a time. Catch that moment and name the pattern. Then check how long it took last time.