Application 1: Data Modeling

In your earlier analysis efforts, specifically in structural modeling, you examined the organization of data within a system. The approach that you used in analyzing that data structure was an object-oriented approach. In this Application you use a structured approach to model the data flow processes as you develop the data aspect of your design.

Consider this scenario: Quality Tools is a company that sells a line of high-quality tools through an online store. When customers place orders on the company’s website, the system checks to see if the items are in stock, issues a status message to the customer, and generates a shipping order to the warehouse, which fills the order. The system automatically bills the customer when the order ships. The system also produces various reports.

For this Application, perform the following:

• Draw a context diagram for the order system.
• Draw a Level 0 DFD for the order system.
• Justify the choices you made in your context diagram and DFD.
• Briefly compare the structured approach you use here with the object-oriented approach outlined in your reading.

Cite your sources according to APA guidelines.
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Application 2: Database Design

When you design a system, how its data is stored, optimized, and accessed are among your primary concerns. If your system cannot work efficiently with well-structured data, then your design would not be of much use to your organization.

For this Application, imagine that you are a systems analyst for a bookstore. You are designing a system to sell books, CDs, and DVDs online. Using what you have learned about data management layer design, address the following in a 2- to 3-page paper:

• Which object-persistence format is best for this system?
• How do the problem-domain classes map to the selected format?
• What techniques would best optimize the design’s processing efficiency?
• What do you need to consider when you design the data access and manipulation (DAM) classes for the system? Create one DAM class as an example.
• Explain each of your recommendations and justify the design choices.

Cite your sources according to APA guidelines.

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