i think the most important bit is: you finish it before picking up another task.

it shouldn't be anything to arduous nor should it be bullshit.

and if on the way, one finds there is more to do, thats just the todolist flying by, it will still be there when the current task is finished... and i can see it can be difficult carrying five mugs to the kitchen when encountering another group of five mugs somewhere in the house..... or something worse... but its important one finishes at least that one originally set task