There are many different types of productivity plans and programs. They all take a somewhat similar approach to getting things done. Most of these systems require planning and diligence in order to execute a predefined set of tasks. However, there is one, very old, very simple system that doesn't require this and still means you will get a whole lot done. It is the "Do It Now" mentality.
The system is simple. Think of a task. Do it. Now.
No planning. No software. Just action.
As simple as it sounds, there is but one rule - finish it. So perhaps, the Do It Now mantra could be better understood as "Start it now. Finish it now.". This productivity mentality has it's place in the world of getting things done, and it shouldn't necessarily be used everywhere at all times. "Do It Now" is best suited at tasks that take no more than one hour from start to finish. No planning.
It's easy. If you see something that needs doing, or one of your colleagues asks you to work on something, take action, straight away. No hesitation, no delays, no procrastination.