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1. and comp com eo Group User Diagram 3 Diagram 1 engineers Group jl engineers Group mail eng comp com 9 p mail eng comp com items items items nders r anders User testers Group anders User il j i mail and comp com mail test comp com mail and comp com Diagram 4 Diagram 2 agra Which of the following statements are true L A Class User must implement operation getName False Class item is abstract italic font style but the operation getName is not abstract Hence getName has an implementation in Item Since the relation is generalization class User inherits the implementation of getName from class Item Hence class User do not need to implement getName even if it can overload it Cl B Class Item cannot be instantiated True Class Item is abstract and can therefore not be instantiated L Diagram 2 is a valid object diagram of class diagram 1 and diagram 3 is not a valid object diagram of class diagram 1 False Neither diagram 2 nor diagram 3 is valid In diagram 3 an instance of class User contains other instances which is not allowed according to the class diagram Diagram 2 looks first correct but note that the multiplicity for the composition relationship is 1 4 Hence an instance of Group must hold at least one item In diagram 2 the instance testers do not contain any items Consequently this object diagram is not a vali
2. 3 Test 4 days Mon 06 11 13 Thu 06 11 16 4 N Figure 1 A minimal project Which of the following statements are true Ll A The critical path for the above project plan is Requirements Design Implementation Test False The critical path is Training Implementation Test Ifthe duration of the training activity is increased the whole project will be delayed L B The slack time of the design phase is 2 working days True The duration of the design phase can be increased with 2 days without affecting the duration of the whole project Note that only working days are counted L C Once you have defined the project plan it is important that you follow it and do not change it during the life cycle False You definitely need to change and update the plan several times during a project since you can do better planning when you get better understanding of the project L D COCOMO TI is an algorithmic method for estimating efforts and Delphi is another effort estimation method based on expert judgements True L After that you have identified and analyzed risks you should plan for how to handle them One alternative is to transfer the risk Another is to accept it and try to mitigate it True TDDC88 TDDC93 A Page 2 9 L F When assigning roles to team members it is important that one individual has only one role e g to be designer analyst or developer False It is very common that
3. LINKOPINGS UNIVERSITET IDA David Broman Kristian Sandahl Quiz Examination in Software Engineering Theory Solutions Date 2007 09 20 Time 11 20 12 00 The printed exam that was handed out at the lecture consisted of three different variants All variants contained exactly the same questions but the order of the statements was permutated so that accidental looking over the shoulder could be avoided This document describes the variant called A The variant indication of the exam can be found at the bottom of the page right to the course code Result ed D 9 18 Pass 0 8 Fail The right answers for the different variants are as follows Variant A Assignment 1 2 3 4 5 6 7 8 Beem B D E B C B D E A D D E A D A E C E Variant B INS 2 3 4 5 6 7 8 HONA A B BE A C F C D B C B D C E B D Variant C Assignment 1 2 3 4 5 6 7 8 ANA C D E D E B E F B C A E B E A E A E TDDC88 TDDC93 A Page 1 9 Problems Assignment 1 Project Management Task Name Duration Start Finish Prede 06 Oct 29 06 Nov 05 06 Nov 12 TIF S S M T W T F S S M T W T F S S M T WITIF Training 7 days Fri06 10 27 Mon 06 11 06 Requirements 2days Fri06 10 27 Mon 06 10 30 Design 3days Tue 06 10 31 Thu 06 11 02 2 Implementation 4 days Tue 06 11 07 Fri 06 11 10 1
4. atistical Usage Testing means that we use statistics when we describe test results False In statistical usage testing the occurrences of the test cases correspond to the probability that certain functions of the system will be used It has nothing to do with statistics about test results L High portability of a system means that that the system can execute on several different platforms True TDDC88 TDDC93 A Page 9 9
5. d instance of the class diagram TDDC88 TDDC93 A Page 4 9 Ll D Diagram 4 is a valid object diagram of class diagram 1 and diagram 2 is not a valid object diagram of class diagram 1 True Diagram 2 is not valid see the answer above Diagram 4 on the other hand is a valid object diagram of class diagram 1 L The composition relationship between Group and Item indicates ownership True This is the basic property of a composition relationship L F The property items is declared as private in the class diagram False The symbol shows that items is public If it would have been declared private the symbol would have been used Assignment 4 Testing part I Which of the following statements are true L A Performance testing addresses non functional requirements One type of such a test is stress testing True L B Failures in software can lead to faults when executing the system False It is the other way around Faults in software can lead to failures when executing the system L C White box testing is a useful technique since information about the internal state of the system is not needed False White box testing needs internal information about the system module What is described here is black box testing Ll D If regression testing succeeds it gives certain guarantees that the system works at least as good as at the last test occasion True TDDC88 TDDC93 A Page 5 9 Assi
6. gnment 5 Testing part Il S a Figure 2 Graph with possible execution paths Cyclomatic complexity V G E N 2P Which of the following statements are true L A Cyclomatic complexity can be used to calculate the number of times a loop construct needs to be tested False Cyclomatic complexity gives the number of linear independent paths in a graph which corresponds to the number of linear independent paths in program It has nothing to do with how often a loop constructs needs to be tested L B The number of paths needed to cover the graph given in figure 2 is 4 False The cyclomatic number for the above graph is 6 The total number of paths are more than 6 L C The number of paths needed to cover the graph given in figure 2 is 5 False See above LC D When implementing a bottom up integration approach you need to implement drivers True For a top down approach stubs would have been needed instead Ll An oracle is a human being or a system that determines if a test is successful by examining the input and the generated output from a test object True TDDC88 TDDC93 A Page 6 9 Assignment 6 Requirements part I Which of the following statements are true L A The requirement The user must be able to change his or her personal password is a functional requirement True Ll B The requirement After 14 days of some usage an average user must be able to run the
7. lly amongst the developers before the acceptance test False During beta testing a version of the software is delivered to a limited audience outside the company L D Since it is generally hard for novices to grasp the idea of an entire system it is a good strategy to wait with interviews of users and customers until only detailed questions of clarification remain False Users and customers should always be interviewed as early as possible so that as correct requirements as possible are captured L A heuristic evaluation during an afternoon with one or two user representatives will normally discover as much as 50 of all existing usability problems True TDDC88 TDDC93 A Page 8 9 Assignment 8 Quality Which of the following statements are true L A People think very differently about usability so it is impossible to measure usability numerically False Even if people think differently we can still do usability tests We can measure things such as time to perform a defined task how many mistakes a test person makes etc L B A system with requirements of high reliability will preferably show a high failure intensity during acceptance testing False If reliability is very important in a product we definitely do not want the system to fail a lot during the acceptance testing at the customer O C A hazard can lead to an incident which in turn can become an accident True L D The term St
8. one team member can have several roles Especially in small teams Assignment 2 Architecture and Design Which of the following statements are true L A The main feature with box and line diagrams is that they are not ambiguous False One of the main problem with box and line diagrams is that they often are ambiguous L B Pipe and filter architecture styles are useful because they are easy to modify and can be implemented with concurrent execution True L C Layered architecture styles are very common in data communication applications True L D A repository model describes a system where databases are located on several distributed nodes and synchronization is performed if needed or on regular basis False The most important aspect of the repository model is that the data is centralized not distributed L The strategy pattern is useful when implementing a publish subscribe system e g when having different views of the same data False The strategy pattern is about encapsulating algorithms What is described here is the observer pattern TDDC88 TDDC93 A Page 3 9 Assignment 3 UML Item mike User 1 4 ia mail String mail mike comp com items getName items items testers Test anders User mail test comp com mail
9. system for at least 4 hours without using any help information look up in the user manual or asking a colleague is a functional requirement False This is a typical non functional requirement L C The requirement The user shall get response within a reasonable time can be regarded as a good requirement since a requirement about response time is hard to measure False It is definitely not a good requirement since we want requirements to be measurable Response time is not particularly hard to measure L D In an information system a use case can describe several requirements and it is thus beneficial to start with use cases and then formulate detailed requirements afterwards if needed True L It is important to vary the language e g use synonyms in a requirements specification so the readers will not become bored when reading the document False The specification should be as precise as possible i e to be unambiguous Varying the language by using synonyms gives the opposite effect TDDC88 TDDC93 A Page 7 9 Assignment 7 Requirements part Il Which of the following statements are true L A Specifying requirements with mathematical formal notation increases clarity i e the specification becomes less ambiguous True L B Quality requirements are preferably specified with use cases False Functional not non functional are captured using use cases L C A beta test is done interna
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