Understanding Your Domain

Its really important to understand what you will develop and its crucial that defining your use cases.

Requirements and Modelling

• Identify User Stories
• Identify the Nouns in the user stories
• Identify the Verbs in the user stories
• Put together object interaction diagram
• Put together object responsibilities diagram
• Put together class digram UML showing only interesting interactions

So here are made up user stories:

• As a customer I want to be able to put products that I want to purchase in to the shopping cart so that I can check out quickly later on
• As a customer I want to see the total cost all for all of the items that are in my cart so that I see if I can afford to buy everything
• As a customer I want to see the total cost of each item in the shopping cart so that I can re-check the price for items
• As a customer I want to see the total cost for all of the items in the shopping cart with total tax
• As a customer I want to be able to specify the address of where all of the products are going to be sent to
• As a customer I want to be able to add a note to the delivery address so that I can provide special instructions to the postman

Now I am going extract nouns and verbs from the stories above. I am looking for the nouns that will become my main objects and not the attributes.

Nouns:

• Customer
• Item
• Order
• Shopping Cart
• Address

Verbs:

• Put products in to the shopping cart
• See total cost for all of the items
• See total cost for each item
• See total tax for my country
• Specify delivery address
• Specify delivery note for delivery address
• Specify invoice address
• Receive invoice for the order

Reference