Step 1.8 Testing access paths

• Think of the questions that the users of the system will want answered
• Verify that the model will provide the answers
• Will a single value be returned when required?
• Will a set of values be returned when required?
• Identify missing associations and attributes
• Identify unnecessary complexity.

For example, in the case of a book seller the object model must answer the following questions:

The book titles bought by a customer The customers that have bought a particular book The inquiries made by a customer The invoices outstanding for a customer The total sales of a particular book The top 10 best selling books