"GTD-Tasks" is one of the simplest yet most effective tools.
A single list to quickly track and manage thoughts, notes, ideas, tasks. For developers perhaps new features, bugs, requirements. Managers may may be happy with high/low, minutes/hours, phone/email variations.
Simplicity allows for speed and accuracy
Inbox
Here is a thought for you:
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How come that we can easily drive 130 km/h with a car, which produces 3000 images per Minute that need to be processed by our brain, but we may need a whole minute to write down 1 piece of information and get it to the right place or act accordingly?
How fast would we be driving, if we would have to stop and think about every single thing we see? Buildings. Trees. Animals. Signs.
It's all about timing. The inbox allows us to capture ALL information at one time and process it at another. It also allows us to collect all information in one place.
Today, Next, Tomorrow
The first one, GTD-Today, seems obvious, however: how many "lists" did you have over the past 12 months that had tasks written for a day and could not get done? Several ABC lists perhaps? Calendars on desk, phone or wall?
GTD-Today means what it says: ONLY add a task if you have to or want to get this done today. Scheduled items will show up here. Consider your calendar and GTD-Today sacret ground - in short: it gives you room to re-negotiate everything else at any given moment, especially GTD-Tomorrow and GTD-Next.
GTD-Next: can't go without it. Me anyways. Piles of lists that became overdue clogged progressive thinking and necessary actions. Not all thoughts are actionable, and not all actions can be given an exact date or time beforehand.
Removing the target-date provides freedom to pick and choose what to do next, except of course for the tasks that have to get done by you today.