Software Engineering Theory And Practice 4th Edition Shari Pfleeger - Solutions

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=+Are transactions lost as capacity is exceeded?
=+· Is data integrity affected as capacity is exceeded?
=+What values of N, T, and D force the server environment to fail?
=+How does failure manifest itself?
=+ Are automated notifications sent to technical sup-port staff at the server site?
=+If the system does fail, how long will it take to come back online?
=+Are certain WebApp functions (e.g ., compute intensive functionality, data streaming capabilities) discontinued as capacity reaches the 80 or 90 per-cent level?
=+25.1. Are there any situations in which WebApp testing should be totally disregarded?
=+25.2. In your own words, discuss the objectives of testing in a WebApp context.
=+25.3. Compatibility is an important quality dimension. What must be tested to ensure that compatibility exists for a WebApp?
=+25.4. Which errors tend to be more serious-client-side errors or server-side errors? Why?
=+25.5. What elements of the WebApp can be "unit tested"?
=+What types of tests must be con-ducted only after the WebApp elements are integrated?
=+25.6. Is it always necessary to develop a formal written test plan? Explain.
=+25.7. Is it fair to say that the overall WebApp testing strategy begins with user-visible ele-ments and moves toward technology elements?
=+ Are there exceptions to this strategy?
=+25.8. Is content testing really testing in a conventional sense? Explain.
=+25.9. Describe the steps associated with database testing for a WebApp. Is database testing predominantly a client-side or server-side activity?
=+25.10. What is the difference between testing that is associated with interface mechanisms and testing that addresses interface semantics?
=+25.11. Assume that you are developing an online pharmacy (YourCornerPharmacy.com)that caters to senior citizens. The pharmacy provides typical functions, but also maintains
=+a database for each customer so that it can provide drug information and warn of potential drug interactions. Discuss any special usability tests for this WebApp.
=+25.12. Assume that you have implemented a drug interaction checking function for YourCornerPharmacy.com (Problem 20.11). Discuss the types of component-level tests that
=+would have to be conducted to ensure that this function works properly. (Note: A database would have to be used to implement this function.)
=+25.13. What is the difference between testing for navigation syntax and navigation semantics?
=+25.14. Is it possible to test every configuration that a WebApp is likely to encounter on the server side?
=+On the client side? Ifit is not, how do you select a meaningful set of configura-tion tests?
=+25.15. What is the objective of security testing?
=+Who performs this testing activity?
=+25.16. YourCornerPharmacy.com (Problem 25.11) has become wildly successful, and the number of users has increased dramatically in the first two months of operation. Draw a graph that depicts probable response time as a function of number of users for a fixed set of
=+server-side resources. Label the graph to indicate points of interest on the "response curve."
=+25.17. In response to it, success YourCornerPharmacy.com (Problem 25.11) has imple-mented a special server solely to handle prescription refills. On average, 1000 concurrent
=+users submit a refill request once every two minutes. The WebApp downloads a 500-byte block of data in response. What is the approximate required throughput for this server in megabits per second?
=+25.18. What is the difference between load testing and stress testing?
=+Do you have to build a fully functional prototype before you test with users?
=+Should you test with the user's device or provide a device for testing?
=+What devices and user groups should you include in testing?
=+What are the benefits/drawbacks of lab testing versus remote testing?
=+26.1. Are there any situations in which MobileApp testing on actual devices can be disregarded?
=+26.2. In your own words, discuss the objectives for testing a Mobile App.
=+26.3. Compatibility is an important quality dimension. What must be tested to ensure that compatibility exists for a Mobile App?
=+26.4. Locate a free Mobile App testing tool. Critique the performance of the tool relative to the Mobile App with which you are familiar.
=+26.5. What elements of the MobileApp can be "unit tested"? What types of tests must be conducted only after the Mobile App elements are integrated?
=+26.6. Is it always necessary to develop a formal written-test plan? Explain.
=+26.7. Is it fair to say that the overall MobileApp-testing strategy begins with user-visible
=+elements and moves toward technology elements? Are there exceptions to this strategy?
=+26.8. Is certification testing really testing in a conventional sense? Explain.
=+26.9. Describe the steps associated with user experience testing for a MobileApp.
=+26.10. Assume that you are developing a MobileApp to access an online pharmacy that caters to senior citizens. The pharmacy provides typical functions, but also maintains a database for each customer so that it can provide drug information and warn of potential drug interactions. Discuss any
=+26.11. Assume that you have implemented a Web service that provides a drug interaction-checking function for YourCornerPharmacy.com (see Problem 26.10). Discuss the types of
=+component-level tests that would have to be conducted on the mobile device to ensure that the Mobile App accesses this function properly.
=+26.12. How can a MobileApp's ability to take context into account be tested?
=+26.13. Is it possible to test every configuration that a Mobile App is likely to encounter in the production environment? If it is not, how do you select a meaningful set of configuration tests?
=+26.14. Describe a security test that might need to be conducted for the YourCornerPhar-macy (Problem 26.10) Mobile App. Who should perform this test?
=+26.15. What is the difference between stress-testing a MobileApp and stress-testing a WebApp?
Where Do Architectures Come From?
What Makes a "Good" Architecture?
1: How does the nature of your organization affect the architectures that it develops? How do the architectures affect the nature of the organization?
2: What kind of business goals drive (or have driven) the creation of the software architectures of your organization?
3: Who are the stakeholders that exert the most influence over the architecture of systems in your organization? What are their goals? Do the goals ever conflict?
Why Is Software Architecture Important?
How is the system to be structured as a set of code units (modules)?
How is the system to be structured as a set of elements that have runtime behavior (components) and interactions(connectors)?
How is the system to relate to nonsoftware structures in its environment (i.e., CPUs, file systems, networks, development teams, etc.)?
1: Software architecture is often compared to building architecture. What are the strong points of this comparison? What is the correspondence in buildings to software architecture structures and views? To patterns? What are the weaknesses of the comparison? When does it break down?
2: What is the difference between a reference architecture and an architectural pattern? What can you do with one that you cannot do with the other in terms of organizational planning and architectural analysis?
3: Do the architectures in your organization recognize the different views (structures and relations) inherent in architecture?If so, which ones? If not, why not?
4: Is there a different definition of software architecture that you are familiar with? If so, think about the ways in which this definition supports our acid test of an architecture: Does it abstract information away from the system and yet provide enough information to be a basis for analysis,
For the system you are currently working on, what are the most important qualities? What are the system-specific scenarios that capture these qualities and what are the general scenarios they make concrete?
Brooks argues that conceptual integrity is the key to successful systems. Do you agree? Can you think of successful systems that have not had this property? If so, what factors made those systems successful anyway? How do you go about measuring a system to see if it meets Brooks's prescription?
Generate scenarios for the business and architecture qualities enumerated in Sections 4.4 and 4.5. Have you captured each quality with your scenarios? Which qualities are difficult to capture with scenarios?
what we mean by software engineering
•software engineering's track record
what we mean by good software
why a systems approach is important
how software engineering has changed since the 1970s
Where and when are we likely to find a particular kiod of fault?
How cao we fiod faults earlier in the development process?
How can we build io fault tole rance so that we minimize the likeLihood that a fault wiU become a failure?
How cao we design secure, high-quality systems?
Are there alternative activities that can make our process more effective or efficient at ensuriog quality?
Give an example of problem analysis where the problem components are relatively simple, but the difficulty in solving the problem lies in the interconnections among subproblem components.
Explain the difference between errors, faults, and failures. Give an example of an error that leads to a fault in the requirements; the design; the code. Give an example of a fault in the requirements that leads to a failure; a fault in the design that le ads to a failure; a fault in the test data
Why can a count of faults be a misleading measure of product quality?
Many developers equate technical quality with overall product quality. Give an example of a product with high technical quality that is not considered high quality by the customer. Are there ethical issues involved in narrowing the view of quality to consider o nly technical quality? Use the
Many organizations buy commercial software, thinking it is cheaper than developing and maintaining software in-house. Describe the pros and cons of using COTS software. For example, what happens if the COTS products are no longer supported by their vend.ors?What must the customer, user, and
What are the legal and ethical implications of using COTS software? Of using subcontractors? For example, who is responsible for fixing the problem when the major system fails as a result of a fault in COTS software? Wh o is liable when such a failure causes harm to the users, directly (as when the
The Piccadilly Television example, as illustrated in Figure 1.17, 'contains a great many rules and constraints. Discuss three of them and explain the pros and cons of keeping them outside the system boundary.
When the Ariane-5 rocket was destroyed, the news made headlines in France and elsewhere. Liberation, a French newspaper, called it "A 37-billion-franc fireworks display" on the front page. In fact, the explosion was front-page news in almost all European newspapers and headed the main evening news
what we mean by a "process"
software development products, processes, and resources
several models of the software development process
tools and techniques for process modeling
How does the description of a system relate to the notion of process models? For example, how do you decide what the boundary should be for the system described by a process model?
For each of the process models described in this chapter, what are the benefits and drawbacks of using the model?
For each of the process models described in this chapter, bow does the model handle a significant change in requirements late in development?
Draw a diagram to capture the process of buying an airplane ticket for a business trip.S. Draw a Lai artifact table to define a module. Make sure that you include artifact states that show the module when it is untested, partially tested, and completely tested.
Using the notation of your choice, draw a process diagram of a software development process that prototypes three different designs and choose the best from among them.
Examine the characteristics of good process models described in Section 2.4. Which characteristics are essential for processes to be used on projects where the problem and solution are not well understood?
In this chapter, we suggested that software development is a creation process, not a manufacturing process. Discuss the characteristics of manufacturing that apply to software development and explain which characteristics of software development are more like a creative endeavor.
Should a development organization adopt a single process model for all of its software development? Discuss the pros and cons.

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