This further allows you to filter the task by types (like calls, emails or errands without you needing to classify), by time taken, by priority, by with whom or where you are doing it or simply by tags (auto tagged).
This makes you find all sorts of opportunities to do your tasks which wouldnt have occurred to you before.
It's best explained by a video which is here https://www.youtube.com/watch?v=p-FPIT29c9c or register for free and see for yourself