Generally, I try to add the next NA as soon as I've completed one. I usually do pretty well when a sequence of actions is clear from the start. I list them (in Outlook) like this:
Call Shirley for numbers: Update data in excel chart: Email to John and Greg: File hardcopy in Linda's office: Complete documentation for w/e 1.20.06.
If I have time to work on the documentation, I just keep working through the steps (and don't stop just to update my list after each step). But if I have to stop, then I need to know what my NA is. When I call Shirley, she either gives the numbers to me over the phone (or faxes them immediately) OR I have to leave her a message and wait for her reply.
Either way, I change the context of the task to the next part (in this example, from @calls to @computer or @waiting for) and update the task description to:
...WF Shirley's Reply: Update data in excel chart: Email to John and Greg: File hardcopy in Linda's office: Complete documentation for w/e 1.20.06.
or
Update data in excel chart: Email to John and Greg: File hardcopy in Linda's office: Complete documentation for w/e 1.20.06.
and then continue to update the context and description until complete:
Email to John and Greg: File hardcopy in Linda's office: Complete documentation for w/e 1.20.06.
File hardcopy in Linda's office: Complete documentation for w/e 1.20.06.
(checked complete) Complete documentation for w/e 1.20.06.
This works especially well for small projects I complete regularly (preparing a newsletter, writing a report, setting up a training, etc.).
But, there are also many times when I don't update as often as I want or complete something but haven't decided what the next action is. Ideally, I take the time to identify the next action, but if it doesn't happen, then the weekly review works as my safety net - do all active projects have a NA? Is there anything else that I need to do that I haven't put onto a list? The weekly review helps me stay on top of things, but I don't use it as the only time I update my next actions.
Julia