Software LEIC. Lecture 23

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1 Software LEIC Lecture 23

2 Last Lecture Software Evolution Project Management

3 Software Process Today

4 What is software development?

5 Software development is a formalisation process

6 From Natural Language to Programming Language

7 There are problems in language transformation Lost in Translation

8 How we address this formalisation problem?

9 Reduce the number of languages less transformations

10 or

11 Define several intermediate languages small transformations

12 What are the main stages?

13 Requirements Engineering the languages of the problem

14 Software Design the languages of the solution

15 Software Implementation the execution languages

16 Software Verification and Validation accurate representations using the languages (problem and solution)

17 Software Process systematic and disciplined approaches to language transformation

18 and

19 Project Management because software development is complex

20 Software Process

21 Stages

22 Stages milestones

23 macro management Stages milestones

24 Activities

25 Requirements engineering Activities

26 Activities Requirements engineering Software design and implementation

27 Activities Requirements engineering Software design and implementation Software validation

28 Activities Requirements engineering Software design and implementation Software validation Software evolution

29 Products result of activities

30 Process Activities

31 Requirements Engineering

32 (Fig 2.4, Sommerville)

33 Software Design and Implementation

34 (Fig 2.5, Sommerville)

35 Software Validation

36 Development (Fig 2.6, Sommerville)

37 (Fig 2.7, Sommerville)

38 System Evolution

39 (Fig 2.8, Sommerville)

40 Requirements Change

41 Requirements Change change avoidance

42 Requirements Change change avoidance change tolerance

43 Requirements Change change avoidance change tolerance system prototyping

44 Requirements Change change avoidance system prototyping change tolerance incremental delivery

45 System Prototyping

46 (Fig 2.9, Sommerville)

47 Incremental Delivery

48 (Fig 2.10, Sommerville)

49 Software Processes Models

50 Waterfall Model stage n activity

51 (Fig 2.1, Sommerville)

52 Incremental Development stage n delivery

53 (Fig 2.2, Sommerville)

54 Reuse-oriented Software Engineering main stage n reusable architecture

55 (Fig 2.3, Sommerville)

56 e.g. object-oriented frameworks (Fig 2.3, Sommerville)

57 Boehm s Spiral Model main stage n risk management

58

59 Rational Unified Process stage n knowledge

60 ( Wikipedia)

61 Agile Methods

62 The Agile Manifesto (

63 The Agile Manifesto Individuals and interactions over processes and tools (

64 The Agile Manifesto Individuals and interactions over processes and tools Working software over comprehensive documentation (

65 The Agile Manifesto Individuals and interactions over processes and tools Working software over comprehensive documentation Customer collaboration over contract negotiation (

66 The Agile Manifesto Individuals and interactions over processes and tools Working software over comprehensive documentation Customer collaboration over contract negotiation Responding to change over following a plan (

67 (Fig 3.2, Sommerville)

68 extreme Programming (

69 How frequent risks are dealt by XP

70

71 Business changes customer can change requirements that are not yet implemented

72 Business changes customer can change requirements that are not yet implemented Schedule slips several small versions, short duration

73 Business changes customer can change requirements that are not yet implemented Schedule slips several small versions, short duration Project cancelled customer chooses the smaller version that has the biggest business impact

74

75 System goes sour a set of test is executed whenever the system is changed

76 System goes sour a set of test is executed whenever the system is changed Defect rate testing from different perspectives:

77 System goes sour a set of test is executed whenever the system is changed Defect rate testing from different perspectives: Programmer

78 System goes sour a set of test is executed whenever the system is changed Defect rate testing from different perspectives: Programmer User

79

80 Business misunderstood customer is part of the team

81 Business misunderstood customer is part of the team False feature rich only the highest priority activities are performed

82 Business misunderstood customer is part of the team False feature rich only the highest priority activities are performed Staff turnover foster communication, programmers estimate their work duration

83

84

85 Scaling Agile Methods

86 lack of contract deal with maintenance world distributed teams

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