1. Context
   1. Whats your business domain?
      1. What are your regulatory requirements?
         1. How will your mnemonic deal with change?
            1. Update/review cadence
2. Knowledge Constraints
   1. Known Knowns
      1. Unknown Knowns
         1. Known Unknowns
            1. (Strategy for) Unknown Unknowns
3. Boundaries
   1. Where does your system begin?
      1. Do you know where it ends?
         1. What it integrates with?
            1. How much your team needs to test those integrations?
4. Synchronicity
   1. Is your system heavily time bound?
      1. Batch processes run on a scheduler?
         1. On demand, asynchrnous customer driven actions?
            1. In the middle?
5. Memorable
   1. Words
      1. Pictures
         1. Diagrams
            1. Rhymes
            2. Riddles