OOP design examples
crc cards
Find some objects/ responsibilities.
What can it do, what should it remember?

Elevator
	buttons
		in elevator
			which floor
		on walls
			up/ down
	elevators
		direction moving
		at which floor
		list of pending requests
		call()
		openDoors()
		...
	elevator controller
		knows elevators	
		
Medical records
	Person
		Doctor (name, office, specialty, priveliges...)
		Patient (name, address, insurance...) 
		Nurse (name, certifications,...)
		Staff
	Record
	?
	MedFacility
		Hospital (Name, capacity...)
		Clinic (Name, address, speicialty...)
		Office (Doctors, ...)
	Support Facility
		Lab
		Pharmacy
		...
	Disease
		(name, indicators, confused with, treatment...) 
		
Bank
	Person
		Customer
		Teller
		Manager
		... (can a person fill several roles?) 
	Account
		Savings
		Checking
		... (anything common about different kinds of accounts?)
	Transaction
	
	Transaction Log