class Customer:
	// functions that the Customer can perform
	//attributes of the Customer
	define waitEmployee
	define signContract
	CreditScore []
	CarRecord []
class Employee:
	//functions that the Employee can perform
	define checkCredit
	define checkCarRecord
	define checkCarAvailability
class Car:
	//attributes of the Car
	Availability
	CarType
class Contract:
	Signed