You can browse all the published concept maps without signing in. If you'd like to create your own concept maps, all you have to do is
sign in with Twitter.
This is where the rubber meets the road and we get things done.
For knowledge workers, there is a lot of work to do defining our work before we can start actually doing our work. The 5 phases of workflow is the GTD model for capturing, defining and doing our work.
The next defined physical, visible action you will take to advance some purpose.
This is where we make sure our trusted system is current and complete.
This is where we put things into our trusted system where they need to go based on their meaning to us.
Any input that has arrived in your world for which you have not defined the meaning.
The practice of setting aside dedicated time (typically a couple of hours) to make sure your system is clean, current and complete. David Allen regularly cites this as the critical success factor for GTD.