One. Focus by definition is a singular point of direction or purpose. You can't think about two things at the same time, no more than you can go in two different directions in the same time.Originally Posted by MCooper
The more you focus on the less focus you have.
You will be more successful with GTD if you have the maturity to decide not to focus on certain projects. Say no.
The number of projects you have in your active project list can vary considerably. I currently have 30. I've had as many as 170. 170 was to much to manage and I had to be ruthless in my culling.
If you aren't going to work on a project in the next couple of weeks it should go on your someday maybe list. A lot also depends upon the amount of focus the project will require. Can you move a project forward with a phone call or an e-mail or do you need 4 hours of block time to draft a report?
I use the Outlook Add-In so my projects are stored in my task list in Outlook in the Projects Category and synced with my palm. That seems to work well enough for me.