At this helpfull post from LifeDev the conclusion is simple:

The fewer tasks you have, the less you have to do to organize them. Focus only on those tasks that give you the absolute most return on your time investment, and you will become more productive and have less to do. You will need only the simplest tools and system, and you will be much less stressed. I think that?s a winning combination.
Focus always on simplifying, reducing, eliminating. And keep your focus on what?s important. Everything else is easy.

Here?s how you can simplify the system:

  1. Reduce your tasks. My philosophy with everything is this: before you organize, reduce. If you only have three things to organize, instead of 20, you actually don?t need to organize. How can you apply that to time management? Reduce what you need to do. You can eliminate tasks, delegate them, postpone them, get out of commitments. For more on this topic read posts I?ve written elsewhere: on Zen Habits, FreelanceSwitch, and Lifehack.
  2. Capture. I think this is one of the most valuable tools of GTD. Write down ideas as they come to you, tasks that you need to do, before you forget about them. Get it out of your head. I carry around a small Moleskine pocket notebook and write things down in that.
  3. MITs. Of all the stuff you need to do, which are the three Most Important Tasks (MITs) you need to do today? Write those on the top of your little notebook (or on your computer) and only those. Those are the three tasks you are going to focus on. Single-task and don?t get distracted from them. If you get only these three things done today, you?ve been very productive.
  4. Batch process. Besides your MITs, there are a lot of little tasks you need to do throughout the day. Don?t let them interrupt the more important stuff. To be more productive, batch them up and do them all at once, preferably towards the end of the day. Batch like things together ? do all your email once a day, at 4 p.m., instead of throughout the day. Do all your paperwork at once. Process your physical inbox to empty. Don?t do them throughout the day. I keep a little list of batch process tasks at the bottom of my notebook page (MITs are at the top).
  5. Goals. I think goals are very important. But having too many can cause you to lose focus, and you?ll end up not doing any of them. Instead, use a simple goal system: choose one goal to focus on this year, and a smaller sub-goal of your one-year goal to accomplish in 6 months. Then choose a smaller sub-goal to accomplish within the next week or two, and each day, work towards that short-term goal. Your MITs for today should include at least one task to move you forward towards your short-term goal. Focus on one goal, not many, and you will make it happen.

Read the full post @ LifeDev >>>