The Area being Modelled is :-
Buyers and Bidders for Products across four different Categories.

A. DESIGN NOTES :
A.1 This is a Statement of the User Requirements.

B. The Things of Interest, ('THINGS'), include :-
B.1 Bidders
B.2 Buyers
B.3 Products.
B.4 Product Categories.
B.5 Sellers.

C. These THINGS are Related as follows :-
This is a Web Site to buy, sell or rent Products in four Categories.

The Scenario includes: 
Four Product Categories :-
1.Automobiles 
2.Home Front 
3.Dining Out
4.Food and Beverage. 

this is like a classified ads.
Operations may be Rent,Sell and Bid. 
A Buyer can make an offer bid for any of these 4 Product Categories.
If the Seller accepts the offer bid then the Buyer can either purchase and rent. 

D. Other Characteristics of these THINGS include :-
D.1 

E. Sample Data includes :-
E.1 

F. Typical Enquiries include :-
F.1