Describe the process in knowing when to stop decomposing a DFD
What will be an ideal response?
One rule is to stop drawing when you have reached the lowest logical level; however, it is not always easy to know what the lowest logical level is. Other, more concrete rules for when to stop decomposing include the following:
• When you have reduced each process to a single decision or calculation or to a single database operation, such as retrieve, update, create, delete, or read
• When each data store represents data about a single entity, such as a customer, employee, product, or order
• When the system user does not care to see any more detail or when you and other analysts have documented sufficient detail to do subsequent systems development tasks
• When every data flow does not need to be split further to show that different data are handled in different ways
• When you believe that you have shown each business form or transaction, computer online display, and report as a single data flow
• When you believe there is a separate process for each choice on all lowest-level menu options for the system
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