Quiz 1.
i. Marginal revenue (MR) function is given by ???? = 80 – 4?? – 4??2. Find the Total Revenue (TR) function.
ii. Find the demand function and average revenue (AR) function by using above Total Revenue (TR) function.
iii. Demand function (P) and Marginal Cost (MC) function of a profit maximizing monopolist is given as follows.?? = 525 – 2??2???? = 6 + 6?? Find the profit function.
iv. Find the profit maximizing output and price of this firm.
Quiz 2.
1. Why does the use of continuous integration make it easier to find bugs in the software that you are developing?
2. What are the differences between continuous integration, continuous delivery, and continuous deployment?
3. What are process metrics and service metrics? Explain why service metrics are easier to collect and potentially more accurate than process metrics.
Quiz 3.
1.Explain how the use of Git and a shared public Git repository simplifies the process of managing open-source development when many developers may be working on the same code.
2. What is issue management, and why is it important for software product development?
3. Explain why there is more to system integration than simply recompiling the code of the software.
Quiz 4.
1.What is the fundamental difference between distributed and centralized code management systems? How does this difference lead to the most significant benefits of distributed code management systems?
2. What does creating a new branch in a code management system mean? What problems can arise when more than one developer is working on the same code and they try to merge their changes with the project master branch?
Quiz 5.
1. Explain why adopting DevOps provides a basis for more efficient and effective software deployment and operation.
2. Briefly explain why it is essential to use a code management system when several developers are involved in creating a software system. What are the benefits of using a code management system if only a single developer is involved?
Quiz 6.
1. What is regression testing, and why is it important? Explain why automated testing makes regression testing straightforward.
2. Explain why it is essential to have a refactoring stage in the test-driven development process.
3. Explain why software security testing is more difficult than functional testing.
4. Give three reasons why you should use code reviews as well as testing when you are developing software.
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Quiz 7.
1. Explain why it is easier to develop automated unit tests than automated feature tests.
2. Using any programming language that you know, write a function/method that accepts a list of integers as a parameter and returns the sum of the numbers in that list. Using an appropriate test framework, write automated tests to test that function. Make sure you test with both incorrect and correct data.
Quiz 8.
Imagine that your software includes a feature that can automatically create a contents list for a document or book. Suggest tests that you might develop to test this feature. It is described by the following user stories: a. As a user, I want to automatically create a contents list for my document that includes all of the headings that I have marked up in my text. b. As a user, I want to be able to identify elements of a contents list and mark these up at different levels. For simplicity, I have left out stories concerned with formatting the contents list.
Quiz 9.
1. Explain why you can never be completely confident that program testing has revealed all the faults in a software product.
2. What are the important distinctions between unit testing and feature testing?
3. Table 9.14 (Gis a simplified version of the scenario I used in Chapter 3D for the iLearn system (see Table 3.6 12). Suggest six end-to-end tests that could be used to test the features of the system in this scenario
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Quiz 10.
1. Explain why the use of ACID transaction management ina database management system helps to avoid system failures.
2. Assume that you can save and restore the state of a program using functions called save_state () and restore_state ( ). Show how these can be used in an exception handler to provide “nonstop” operation, where in the event of a failure, the system state is restored to the last saved state and execution is restarted from there.
Quiz 11.
1. Using the regular expression library in a programming language that you know, write a short program to check whether a filename conforms to the Linux rules for filenames. Look up these tules if you don’t know them.
2. An alternative to using regular expressions to check that an input string is valid is to write your own code to check the input. ‘What are the advantages and disadvantages of using this approach?
1.Based on your own programming experience, suggest three examples of code smells, apart from those listed in Table 8.6 0, that might suggest the need for program refactoring.
2. The Luhn algorithm is one of the checks applied to test whether a credit card number is valid. Assuming that credit card numbers are 16 digits long, look up and implement the Luhn algorithm to check that a valid credit card number has been input.
Quiz 12.
1. Describe, in your own words, each of the seven quality attributes shown in Figure 8.10.
2. Explain why reducing the complexity of a program is likely to reduce the number of faults in that program.
3. Explain why it is practically impossible to avoid introducing complexity into a software product.
4. Give two reasons why using design patterns in your code contributes to fault avoidance.
1.You are a software product manager for a company developing educational software products based on scientific simulations. Explain why it is important to develop a product roadmap so that final product releases are available in the first three months of the year.
2. Why should you implement a prototype before you start developing a new software product?
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Quiz 13.
1. Briefly describe the fundamental differences between project based and product-based software engineering.
2. What are three important differences between software products and software product lines.
3. Based on the example project vision for the I Learn system, identify the WHAT, WHO, and WHY for that software product.
4. Why do software product managers have to be generalists, with a range of skills, rather than simply technical specialists?
Quiz 14.
1. Why is it difficult to establish a set of privacy standards that can be applied internationally in software products?
2. A Chinese e-commerce company decides to expand its, business into the European Union. It proposes to use a local cloud vendor for application server provision but to transfer user information to servers in China for analysis. Explain why this information transfer might be illegal, according to data protection legislation. (Hint: Look at the issues related to keeping data anonymous.)
1. Explain why it is normally preferable to use a database’s built-in encryption support rather than implement your own application-level encryption.
2. Explain how encryption keys are securely exchanged in the TLS protocol.
3. What are the problems in maintaining confidential information that, by law, has to be kept for a number of years? How can a key management system help with these problems?
Suggest, giving reasons, appropriate forms of authentication for the following products:
a. An e-learning product for teachers and students, funded by advertising, that allows users to recommend videos and other learning material on a range of topics.
b. A personal finance app for mobile devices that can automatically transfer funds between different accounts based on rules set up by the user.
c. A human resources product for businesses that helps manage the process of recruiting new staff.
Quiz 15.
1. Why should you use continuous deployment in micro services architecture? Briefly explain each of the stages in the continuous deployment pipeline.
2. Briefly describe the three main types of threat that have to be considered when planning how to secure a software product against cyber-attacks.
3. Explain in your own words what you understand by an SQL injection attack. Explain how you can use data validation to avoid such attacks.
Quiz 16.
1. What is a timeout and how is it used in service failure management? Explain why a circuit breaker is a more efficient mechanism than timeouts for handling external service failures.
2. Explain what is meant by a “resource.” How do RESTful services address resources and operate on them?
3. Consider the Upload service for photographs to be printed as shown in Figure 6.5 (0). Suggest how this might be implemented and then design a RESTful interface for this service, explaining the function of each of the HTTP verbs. For each operation, identify its input and output.
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Quiz 17.
1. What are the principal problems with multi-tier software architectures? How does a micro services architecture help with these problems?
2. Explain the differences between synchronous and asynchronous micro services interactions.
3. Explain why each micro service should maintain its own data. Explain how data in service replicas can be kept consistent?
1. Extend the IEEE definition of software architecture to include a definition of the activities involved in architectural design.
2. An architecture designed to support security may be based on either a centralized model, where all sensitive information is stored in one secure place, or a distributed model, where information is spread around and stored in many different places. Suggest one advantage and one disadvantage of each approach.
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Quiz 18.
1.What do you think are the weaknesses of scenarios as a way of envisaging how users might interact with a software system?
2. Starting with Jack’s scenario (Table 3.5 (2), derive four user stories about the use of the iLearn system by both students and teachers.
3 What do you think are the weaknesses of user stories when used to identify system features and how they work?
Quiz 19.
1. Based on your own experience of school and teachers, write a persona for a high school science teacher who is interested in building simple electronic systems and using them in class teaching.
2. Extend Jack’s scenario, shown in Table 3.5 10, to include a section in which students record audio reminiscences from their older friends and relatives and include them in the iLearn system.
Quiz 20.
1. Look at the code for ColumnFixture and note how the method bind() is called from doRows() with the header row. Note how a TypeAdapter is created for each column of the header row and is reused for each test row.
2. The tests would be strengthened if we also tested that the original rental items returned to their original state. Do this by generating another table at the end of the test to ensure this.
3. When a return is picked from the list of returns, all the rental items in that rental are returned. Change the test generator to make partial returns.
1. Write a fixture for the grace period table(s) that you developed for the earlier exercises in Chapter 13.
2. Write one or more fixtures for the Fit tests for your own application’s business rules, as you developed them for the later exercises in Chapter 13. 37.8 Exercises
3. Look at the code for Action Fixture, which is quite short. Follow through the code to see what happens when an enter action is carried out.
1. Decide whether the Point class defines a suitable to String() method.
2. If not, you’ll need to introduce an intermediate (adapter) class to manage the conversion of a Point to a String.
3. In your application, now choose a class that has specialized values that would be handy to use in the cells of Fit tests. Carry out the preceding steps for your class.
4. Install FitNesse on your machine and carry out some of the exercises from Chapter 8.
1. Write simple tables and corresponding fixtures for some of the tables in the exercises in Chapter 3.
2. Write a table that encodes spaces specially as ((SPACE)). Develop the corresponding ColumnFixture fixture class to handle spaces correctly to and from the system under test.
3. For the ActionFixture tables that you created for exercise 3 in Chapter 4, write the corresponding fixture.
1. Experiment with changing the supplied example fixture classes and corresponding tables. Note the errors that result from a mismatch between the table and the fixture.
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2. What happens if instance variables and methods in the ColumnFixture subclass are not referred to in the table?
3. What happens if a void method is provided in the fixture for a calculated column?
1. Write simple tables and corresponding fixtures for some of the tables in the exercises in Chapter 3.
2. Write a table that encodes spaces specially as ((SPACE)). Develop the corresponding ColumnFixture fixture class to handle spaces correctly to and from the system under test.
3. For the ActionFixture tables that you created for exercise 3 in Chapter 4, write the corresponding fixture.
1. Experiment with changing the supplied example fixture classes and corresponding tables. Note the errors that result from a mismatch between the table and the fixture.
2. What happens if instance variables and methods in the ColumnFixture subclass are not referred to in the table?
3. What happens if a void method is provided in the fixture for a calculated column?
1. Should we consider the case in which the hourly rate is greater than the daily rate? What assumptions and/or higher-level policies do you draw on? What tests may this thinking lead to?
2. Choose an area for which you have written, or could imagine writing, many workflow tests. Copying a workflow test repeatedly and making small changes to it is a good indication that there may be calculation-based tests waiting to get out. Look for such tests and extract them.
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