exersize

FIGURE 6-20

You must draw at least a context diagram and a level-0 diagram. In drawing these diagrams, if you discover that the narrative is incomplete, make up reasonable explanations to complete the story. Provide these extra explanations along with the diagrams.

Dr. Frank’s walk-in clinic has decided to go paperless and will use an information system to help move patients through the clinic as efficiently as possible. Patients are entered into the system by the front desk personnel. If this is the first time the patient has been seen, insurance

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and basic demographic information is collected from the patient. If the patient has been seen previously, the patient is asked to verify the information. The front desk person then ensures that the patient has a chart in the electronic medical records system; if not, a new medical record is started. The patient is then entered into a queue to wait for a medical technician who will collect health history, weight, height, temperature, blood pressure, and other medical information, placing it into the patient’s medical record. Next, the patient is placed into the queue to see a doctor. The first available doctor sees the patient, prescribes medication or treatment when appropriate, and sends the patient to checkout. The person at checkout collects the payment for the services, prints out any prescriptions for medications or treatments, and provides a printed record of the health services received.

FIGURE 6-21 Diagram with levels 0, 1, and 2.

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11.a. Starting with a context diagram, draw as many nested DFDs as you consider necessary to represent all of the details of the engineering document management system described in the following narrative. You must draw at least a context diagram and a level-0 diagram. In drawing these diagrams, if you discover that the narrative is incomplete, make up reasonable explanations to complete the story. Provide these extra explanations along with the diagrams.

Projects, Inc. is an engineering firm with approximately 500 engineers that provide mechanical engineering assistance to organizations, which requires managing many documents. Projects, Inc. is known for its strong emphasis on change management and quality assurance procedures. The customer provides detailed information when requesting a document through a web portal. The company liaison (a position within Projects, Inc.) assigns an engineer to write the first draft of the requested document. Upon completion, two peer engineers review the document to ensure that it is correct and meets the requirements. These reviewers may require changes or may approve the document as is. The original engineer updates the document until the reviewers are satisfied with the quality of the document. The document is then sent to the company liaison, who performs a final quality check and ensures that the document meets the requirements specified by the customer. Finally, the customer liaison sends the document to the customer for approval. The customer can require changes or accept the document. When the customer requires changes, the company liaison assigns an engineer to make the changes to the document. When those changes are made, two other engineers must review them. When those reviewers are satisfied with the changes, the document is sent back to the company liaison, who sends the document back to the customer. This may happen through several iterations until the customer is satisfied with the document.

b. Analyze the DFDs you created in part a. What recommendations for improvements can you make based on this analysis? Draw new logical DFDs that represent the requirements you would suggest for an improved document management system. Remember, these are to be logical DFDs, so consider improvements independent of technology that can be used to support the management of these documents.

12. A company has various rules for how payments to suppliers are to be authorized. Some payments are in response to an approved purchase order. For approved purchase orders under $5,000, the accounting clerk can immediately issue a check against that purchase order and sign the check. For approved purchase orders between $5,000 and $10,000, the accounting clerk can immediately issue a check but must additionally obtain a second signature. Payments for approved purchase orders over $10,000 always require the approval of the accounting manager to issue the check as well as the signature of two accounting clerks. Payments that are not covered by a purchase order that are under $5,000 must be approved by the accounting manager and a departmental manager that will absorb the cost of the payment into that department’s budget. Such checks can be signed by a single accounting clerk. Payments that are not covered by a purchase order that are between $5,000 and $10,000 must be approved by the accounting manager and a departmental manager, and the check must have two signatures. Finally, payments exceeding $10,000 that are not covered by a purchase order must be approved by a department manager, the accounting manager, and the chief financial officer. Such checks require two signatures. Use a decision table to represent the logic in this process. Write down any assumptions you have to make.