Why combining methods usually beats picking just one
These methods solve different problems, so most experienced users combine two or three rather than adopting a single system wholesale -- a common pairing is GTD for capturing everything, the Eisenhower Matrix for deciding what matters, and time blocking or Pomodoro for actually protecting the time to do it. Treating any one method as a complete solution on its own is a common reason people abandon a system a few weeks in.
Start from the symptom, not the method
Rather than picking a method because it is popular, naming the actual symptom first -- forgetting commitments, confusing urgent with important, a calendar that fills itself with other people's priorities, an inability to see project status, or difficulty starting focused work -- points fairly directly to which method addresses that specific failure, and makes it much easier to evaluate whether a method is actually working after trying it.
Frequently Asked Questions
Do I need special software for any of these methods?
No -- every method here was originally designed to work with paper, and most people can start with a notebook, sticky notes, or a basic calendar. Dedicated apps can make a chosen method more convenient once you know it fits your work, but they are not a prerequisite for trying one.
What if I try a method and it does not seem to help?
That is normal and often means the method does not match your actual bottleneck rather than that productivity systems in general do not work for you -- if time blocking does not help, for instance, the underlying problem might really be prioritization (better solved by the Eisenhower Matrix) rather than time protection.