1. Data interchanging
   1. in parts, to interchange information with others
   2. as a complete file(s), e.g. to be edited on a computer at work, then resent to the PDA
   3. by
      1. bluetooth
      2. wireless
      3. media (usb-stick ...)
2. Platform
   1. Java?
   2. Desktop Computer
      1. Windows
      2. Linux
      3. Mac
   3. PDA
      1. Palm OS
      2. Symbian
      3. iPhone
      4. ...
3. User Interaction (depending on platform possibilities)
   1. Task Outliner and Time Planner can be seen together in a sort of split view window
   2. Drag and Drop (Mouse/Touch Screen)
   3. Keyboard (Shortcuts etc.)
4. Time Planner (fitting tasks into days)
   1. Tasks can be dropped into a calendar, automatically with ...
      1. link to corresponding task in the Task List (vice-versa editing)
      2. time frame (by Time needed for completion)
      3. notes
      4. alarm
      5. repeat
      6. check-off box / checking off optionally results in:
         1. cancelling due / start dates
         2. cancelling alarms
         3. resetting priority
         4. tracking used time
   2. Views
      1. one day
      2. two or more days (7 = week)
      3. one or more months (with representative symbols?)
      4. all Views graphical
5. Task Outliner (keeping an overview, making plans, thinking)
   1. Item Details
      1. content-related (mainly user defined)
         1. Category, possibly with Sub-Category
         2. Keywords
         3. Dates
            1. created on (automatic)
            2. start at
            3. due by
            4. completed on (automatic)
         4. Time needed for completion
         5. Priority
         6. Notes
         7. Alarm
         8. Repeat
         9. private
      2. status-related (mainly automatically calculated)
         1. Completion
            1. done / undone
            2. done by percentage / remaining time necessary
         2. Type
            1. Simple (for Headers, Info etc.)
            2. Task
            3. Project (with Show-only-Next-Action-Item Switch)
   2. Filter, Sort & Search Possiblities
      1. by Item Details
      2. by Text
   3. Views
      1. graphical: e.g. as sized bubbles (compare Mind Maps)
         1. Sizing by
            1. priority
            2. due date
            3. remaining time necessary
      2. textual: as hierarchical list (foldable & zoomable)
         1. Subject I
            1. Project A
            2. Task A1
            3. Task A2
            4. Task B
            5. Task C
         2. Subject II
            1. Project D
            2. Task D1
            3. Task D2
            4. Task E