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computer sciences
systems analysis and design
Systems analysis and design 5th edition Alan Dennis, Barbara Haley Wixom, Roberta m. Roth - Solutions
What is meant by a DFD semantic error? Provide an example.
Creating use cases when working with users is a recent development in systems analysis practice. Why is the trend today to employ use cases in user interviews or JAD sessions?
How can you make a DFD easier to understand?
Suppose that your goal is to create a set of DFDs. How would you begin an interview with a knowledgeable user? How would you begin a JAD session?
Draw a level 0 data flow diagram (DFD) for the process of buying glasses in Exercise A, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the dentist office system in Exercise B, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the university system in Exercise D, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the real estate system in Exercise E, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the video store system in Exercise F, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the health club system in Exercise G, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the Picnics R Us system in Exercise H, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the Of-the-Month Club system in Exercise I, Chapter 4.
Draw a level 0 data flow diagram (DFD) for the university library system in Exercise J, Chapter 4.
The Hatcher Company is in the process of developing a new inventory management system. One of the event handling processes in that system is Receive Supplier Shipments. The (inexperienced) systems analyst on the project has spent time in the warehouse observing this process and developed the
Professional and Scientific Staff Management (PSSM) is a unique type of temporary staffing agency. Many organizations today hire highly skilled technical employees on a short-term, temporary basis to assist with special projects or to provide a needed technical skill. PSSM negotiates contracts with
A wealthy businessman owns a large number of paintings that he loans to museums all over the world. He is interested in setting up a system that records what he loans to whom so that he doesn't lose track of his investments. He would like to keep information about the paintings that he owns as well
Consider the accompanying system, which was described in Chapter 4. Use the use cases and process models that you created in Chapters 4 and 5 to help you answer the questions that follow. The Campus Housing Service helps students find apartments. Owners of apartments fill in information forms about
Locate the independent entities on Figure. How do you know which of the entities are independent? Locate the nonidentifying relationships. How did you find them? Can you create a rule that describes the association between independent entities and nonidentifyingrelationships?
Locate the dependent entities on Figure. Locate the identifying relationships. How did you find them? Can you create a rule that describes the association between dependent entities and identifyingrelationships?
Resolve the M:N relationship between the sale and available tune that is shown in Figure 6-14. What kinds of information could you capture about this relationship? What would the new ERD look like? Would the intersection entity be considered dependent or independent? Can you think of other kinds of
A charter company owns boats that are used for charter trips to islands. The company has created a computer system to track the boats it owns, including each boat's ID number, name, and seating capacity. The company also tracks information about the various islands, such as their names and
I have two very different stories regarding data models. First, when I worked with First American Corporation, the head of Marketing kept a data model for the marketing systems hanging on a wall in her office. I thought this was a little unusual for a highlevel executive, but she explained to me
A large direct health and insurance medical provider needed an enterprise information management (EIM) system to enable enterprise wide information management and to support the effective use of data for critical cross-functional decision making. In addition, the company needed to resolve issues
Provide three different options that are available for selecting an identifier for a student entity. What are the pros and cons of each option?
What is the purpose of developing an identifier for an entity?
What type of high-level business rule can be stated by an ERD? Give two examples.
Define what is meant by an entity in a data model. How should an entity be named? What information about an entity should be stored in the CASE repository?
Define what is meant by an attribute in a data model. How should an attribute be named? What information about an attribute should be stored in the CASE repository?
Define what is meant by a relationship in a data model. How should a relationship be named? What information about a relationship should be stored in the CASE repository?
A team of developers is considering including "warehouse" as an entity in its data model. The company for whom they are developing the system has just one warehouse location. Should "warehouse" be included? Why or why not?
What is meant by a concatenated identifier?
Describe, in terms a businessperson could understand, what are meant by the cardinality and modality of a relationship between two entities.
What are metadata? Why are they important to system developers?
What is an independent entity? What is a dependent entity? How are the two types of entities differentiated on the data model?
Explain the distinction between identifying and non-identifying relationships.
What is the purpose of an intersection entity? How do you know whether one is needed in an ERD?
Describe the three-step process of creating an intersection entity.
Is an intersection entity dependent or independent? Explain your answer.
What is the purpose of normalization?
Describe how the data model and process model should be balanced against each other.
What is a CRUD matrix? How does it relate to process models and data models?
Draw data models for the following entities:• Movie (title, producer, length, director, genre)• Ticket (price, adult or child, show-time, movie)• Patron (name, adult or child, age)
Draw a data model for the following entities, considering the entities as representing a system for a patient billing system and including only the attributes that would be appropriate for this context:• Patient (age, name, hobbies, blood type, occupation, insurance carrier, address, phone)•
Draw the relationships that follow. Would the relationships be identifying or non identifying? Why?1. A patient must be assigned to only one doctor, and a doctor can have many patients.2. An employee has one phone extension, and a unique phone extension is assigned to an employee.3. A movie theater
Draw an entity relationship diagram (ERD) for the following situations:1. Whenever new patients are seen for the first time, they complete a patient information form that asks their name, address, phone number, and insurance carrier, all of which are stored in the patient information file. Patients
Examine the data models that you created for Exercise D. How would the respective models change (if at all) on the basis of these corresponding new assumptions?• Two patients have the same first and last names.• Researchers can be associated with more than one institution.• The store would
Create metadata entries for the following data model components and, if possible, input the entries into a computer-aided software engineering (CASE) tool of your choosing:• Entity—product• Attribute—product number• Attribute—product type• Relationship—company makes many products,
Describe the assumptions that are implied from the data model shown at the top of this page.
Create a data model for one of the processes in the end-of-chapter Exercises for Chapter 4. Explain how you would balance the data model and process model.
Apply the steps of normalization to validate the models you drew in Exercise D.
You have been given a file that contains fields relating to CD information. Using the steps of normalization, create a logical data model that represents this file in third normal form. The fields include the following:• Musical group name• Musicians in group• Date group was formed•
West Star Marinas is a chain of 12 marinas that offer lakeside service to boaters; service and repair of boats, motors, and marine equipment; and sales of boats, motors, and other marine accessories. The systems development project team at West Star Marinas has been hard at work on a project that
The system development team at the Wilcon Company is working on developing a new customer order entry system. In the process of designing the new system, the team has identified the following data entity attributes:Inventory OrderOrder Number (identifier)Order DateCustomer NameStreet
Pretend that you have been asked to build a system that tracks student involvement in activities around campus. You have been given a file with information that needs to be imported into the system, and the file contains the following fields:■ Student Social Security number (identifier)■
Suppose that your university were interested in creating a new course registration system that could support Web-based registration.QUESTION:What should the university consider when determining whether to invest in a custom, packaged, or outsourced system solution?
I worked with a large financial institution in the southeast that suffered serious financial losses several years ago. A new chief executive officer was brought in to change the strategy of the organization to being more customer-focused. The new direction was quite innovative, and it was
Value-added contracts can be quite rare-and very dramatic. They exist when a vendor is paid a percentage of revenue generated by the new system, which reduces the up-front fee, sometimes to zero.The landmark deal of this type was signed several years ago by the City of Chicago and EDS (a large
Summarize the distinctions between the analysis phase and the design phase of the SDLC.
Describe the primary activities of the design phase of the SDLC.
List and describe the contents of the system specification.
Describe the three primary strategies that are available to obtain a new system.
What circumstances favor the custom design strategy?
What circumstances favor the use of packaged software?
What circumstances favor using outsourcing to obtain the new system?
What are some problems associated with using packaged software? How can these problems be minimized?
What is meant by customizing a software package?
What is meant by creating a workaround for a software package? What are the disadvantages of workarounds (if any)?
What is involved with systems integration? When is it necessary?
Describe the role of application service providers (ASPs) in obtaining new systems. What are their advantages and disadvantages?
Distinguish between a traditional ASP and a provider of software as a service. What are the pros and CMS of each solution approach?
Explain the distinctions between time and arrangements, fixed-price, and value-added outsourcing contracts. What are the pros and cons of each?
What is the purpose of a request for proposal (RFP)? How does it differ from the RFI?
What information is typically conveyed in an RFP?
What is the purpose of the weighted alternative matrix? Describe its typical content.
Should the analysis phase be eliminated or reduced when we intend to use a software package instead of custom development or outsourcing?
Assume that you are developing a new system for a local real estate agency. The agency wants to keep a database of its own property listings and also wants to have access to the citywide multiple listings service used by all real estate agents. Which design strategy would you recommend for the
Assume that you are developing a new system for a multistate chain of video stores. Each store will run a fairly standardized set of video store processes (cataloging video inventory, customer registration, video rentals, video returns, overdue fees, etc.). In addition, each store's system will be
Susan, president of MOTO, Inc., a human resources management firm, is reflecting on the client management software system her organization purchased four years ago. At that time, the firm had just gone through a major growth spurt, and the mixture of automated and manual procedures that had been
Think about the course registration system in your university. First, develop a set of nonfunctional requirements as if the system were to be developed today. Consider the operational requirements, performance requirements, security requirements, and cultural and political requirements. Then create
Many multinational organizations provide global Web-based e-learning courses to their employees. First, develop a set of nonfunctional requirements for such a system. Consider the operational requirements, performance requirements, security requirements, and cultural and political requirements.
Develop a hardware and software specification for the university course registration system described in “Your Turn 8-1.”
Develop a hardware and software specification for the global e-learning system described in “Your Turn 8-2.”
At the end of 1997, Oxford Health Plans posted a $120 million loss to its books. The company's unexpected growth was its undoing because the system, which was originally planned to support the company's 217,000 members, had to meet the needs of a membership that exceeded 1.5 million. System users
Quinnipiac University is a four-year university in Hamden, Connecticut, with about 7400 students. The IT staff has to support academic functions- but, since the university has residence halls, the IT staff has to be an "Internet service provider" (ISP) for students as well. The IT staff can shape
Lithonia Lighting, located just outside of Atlanta, Georgia, is the world's largest manufacturer of light fixtures, with more than $1 billion in annual sales. One afternoon, the power transformer at its corporate headquarters exploded, leaving the entire office complex, including the corporate data
I've had the opportunity to develop two multilingual systems. The first was a special-purpose decision support system to help schedule orders in paper mills called BCW-Trim. The system was installed by several dozen paper mills in Canada and the United States, and it was designed to work in either
List and describe the four primary functional components of a software application.
List and describe the three primary hardware components of a system.
Explain the client-server architecture.
Explain the server-based architecture.
Explain the client-based architecture.
Distinguish between the two-tier, three-tier, and n-tier client-server architectures.
Compare and contrast the server-based, client based, and client-server architectures.
What is meant by the term scalable? What is its importance in architecture selection?
Explain the term Virtualization.
Describe cloud computing and how it is impacting architecture choices.
Describe the types of operational requirements and how they may influence architecture design.
Describe the types of performance requirements and how they may influence architecture design.
Describe the types of security requirements and how they may influence architecture design.
What is meant by system value? Explain how various systems can have a different value to the organization.
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