Detail Design

Algorithms

Pull

Next Question

Startup

program publishes “program-ready”.

Auto Dir

isAutoDir is boolean.
isAutoDir is maintained by object program.
When user clicks button, program toggles isAutoDir, and publishes “changedirection-complete”.

Two objects subscribe to changedirection-complete: coach and desk.
Coach - save internal copy of isAutoDir, call Pull, call Next Question.
Desk - save internal copy of isAutoDir, changes UI.