---
View:
  Responsibilities:
    - (what the class does)
    - Render the Model
    - Transform coordinates
    - 
    - 
    - 
  Collaborations:
    - (related objects)
    - Controller
    - Model
    - 
    - 
    - 
---
Controller:
  Responsibilities:
    - (what the class does)
    - Interpret user input
    - Distribute control 
    - 
    - 
    - 
  Collaborations:
    - (related objects)
    - View
    - Model
    - 
    - 
    - 
---
Model:
  Responsibilities:
    - (what the class does)
    - Maintain problem related info
    - Broadcast change notification
    - 
  Collaborations:
    - (related objects)
    - 
    - 
    -