The full description of this system can be found in my book Do It Tomorrow.
The book’s basic premise is that we get behind on our work because we don’t pay attention to the basic formula “One day’s outgoing work much on average equal one day’s incoming work”. The idea is that one day’s worth of incoming work is collected for action the following day in a dated “Task Diary”. A line is drawn at the bottom of the day’s list so that each day there is a finite amount of work to do. Tasks which arise during the day and have to be done that day may be added to the list “below the line” but the default is to add tasks to the next day’s list. If one falls more than a few day’s behind, then it is important to audit the outstanding work in order to cut it back so that one can keep up. There is also the concept of the “Current Initiative”, by which one project is focused on first thing every day. This is particularly suitable for backlogs, work on improving systems, and getting major projects up and running.
By providing a finite amount of work to be done each day, the system enables you to know when your work for the day is finished. It makes it easy to diagnose what the matter is if you fall behind. It also introduces several important concepts which are made further use of in the subsequent Autofocus systems, such as little and often, recurring tasks, and so on.
The two main disadvantages are that people are often reluctant to carry out a proper diagnosis when they fall behind. This considerably reduces the effectiveness of the system if it is constantly running behind. There is also a considerable effort needed to push through to completing a day’s work, which can lead to resistance building against the system.
This is still a favourite system of many people. It works well for those who are prepared to work at it in a disciplined manner. However many find it too exacting.