Now, back to the ABC
In other words, as per the previous couple of posts, when it comes to ABC prioritization, I think that:
1. As a means to put blocks of tasks in a "doing order", i.e. first block A, then block B etc, I would not do that. I instinctively do not like it. It is a step in the direction of soft scheduling. All I ever do is star some tasks that I am going to do now, or soon, or even aim tentatively to be able to do today. But no more. And all that is only tentative.
2. As a means to separate tasks into three categories of importance, however, i.e. priority in the second sense I mentioned above, I think ABC is very, very good indeed. I do this, and am superbly satsified with it:
When I select additional tasks from the list that match a particular context etc, I also always check the most important tasks (A), and compare and choose. This gives the most important tasks a chance to always get noticed and considered.
When I review my lists at intervals, I use the three levels to distinguish between three different review frequencies. The top category I always check every single time I step into the list. The middle category I check as per the GTD standard (Next=Daily, Someday=Weekly etc). The low category I check much more seldom (low Next I check weekly).