Hi
a>
would anyone recommand one or several good books about object-oriented analyis and 
design? both in theoretic and practice?

b>
and I have one question:
in our system, there are classes: Order, OrderItem, Product.
one Order has 1 to many OrderItems, each OrderItem has relationship to One Product.
there are two method to model them:
1) Order: int orderID,Date orderDate, Collection items
   OrderItem: int lineNo, int qty, double price, Product product
   Product: Int productID, String name, String UOM
2) Order: int orderID,Date orderDate 
   OrderItem: int orderID, int lineNo, int qty, double price, int productID
   Product: Int productID, String name, String UOM
which one is more OO?

c>
are there any theory in OOAD about how to model these kind of relationship?
are there any theory in OOAD just like normalization in RDBMS design?

thanks


            Tian WeiJun
            [EMAIL PROTECTED]

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