Do the following Mini Cases:

$1.$ Globe Consulting

You are a senior systems analyst at Globe Consulting, a growing IT consulting firm. You are leading the development team for a major client. You need to explain data and process modeling to your two newly hired junior analysts $($Michelle and Aidan$)$ before meeting with the client tomorrow afternoon.

Tasks:

Describe the rules for creating DFDs$.$

What are the data flow and process combinations that must be avoided when creating a DFD$?$

Explain what a diagram $0$ is and how it is used.

$2.$ Kitchen Gadgets

Kitchen Gadgets sells a line of high$-$quality kitchen utensils and gadgets. When customers place orders on the company's Web site or through electronic data interchange $($EDI$),$ 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. When the order is shipped, the customer is billed. The system also produces various reports.

Tasks:

List four elements used in DFDs$,$ draw the symbols, and explain how they are used.

Draw a context diagram for the order system.

Draw a diagram $0$ DFD for the order system.

Explain the importance of leveling and balancing. Your boss, the IT director, wants you to explain FDDs$,$ BPM$,$ DFDs$,$ and UML to a group of company managers and users who will serve on a systems development team for the new marketing system.

$3.$ Big State University

The Big State University course catalog reads as follows: $"$To enroll in MIS $260,$ which is an advanced course, a student must complete two prerequisites: MIS $120$ and MIS $222.$ A student who completes either one of these prerequisites and obtains the instructor's permission, however, will be allowed to take MIS $260."$

Tasks:

Create a decision table that describes Big State University course catalog regarding eligibility for MIS $260.$ Show all possible rules.

Draw a simplified decision tree to represent the Big State University catalog. Describe the results.

Why might you use a decision tree rather than a decision table?