1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
1
00:00:00,120 --> 00:00:03,550
After we have built our system, verification and validation
2
00:00:03,550 --> 00:00:05,970
is that phase of software development that aims to
3
00:00:05,970 --> 00:00:09,000
check that the software system meets its specification and
4
00:00:09,000 --> 00:00:12,800
fulfills its intended purpose. More precisely, we can look
5
00:00:12,800 --> 00:00:16,250
at verification and validation independently. And validation is the
6
00:00:16,250 --> 00:00:19,100
activity that answers the question did we build the
7
00:00:19,100 --> 00:00:21,420
right system. Did we build the system that the
8
00:00:21,420 --> 00:00:26,030
customer wants? That will make the customer happy. Whereas verification
9
00:00:26,030 --> 00:00:28,730
answers a different question which is did we build the system
10
00:00:28,730 --> 00:00:31,410
right. So given a description of the system that is the one
11
00:00:31,410 --> 00:00:34,280
that we derived from the customer through the collection of requirements
12
00:00:34,280 --> 00:00:37,130
and then design and so on, did we build a system that
13
00:00:37,130 --> 00:00:41,150
actually implements the specification that we defined? And when we look
14
00:00:41,150 --> 00:00:44,600
at verification there's many, many ways of doing verification and in fact
15
00:00:44,600 --> 00:00:48,430
in the mini course number four we will cover verification extensively. The
16
00:00:48,430 --> 00:00:51,100
only thing I want to mention here is the fact that verification
17
00:00:51,100 --> 00:00:54,110
can be performed at different levels. In particular, it can be
18
00:00:54,110 --> 00:00:57,810
performed at the unit level in which we test that the individual
19
00:00:57,810 --> 00:01:01,520
units work as a expected. Can be performed in the integration level
20
00:01:01,520 --> 00:01:05,525
in which what we test is the interaction between the different units.
21
00:01:05,525 --> 00:01:07,630
So we want to make sure that the different modules talk
22
00:01:07,630 --> 00:01:10,720
to each other in the right way. And finally, there is system
23
00:01:10,720 --> 00:01:13,440
testing in which we test the system as a whole and we
24
00:01:13,440 --> 00:01:16,170
want to make sure that all the system, all the different pieces
25
00:01:16,170 --> 00:01:18,010
of the system work together in the right
26
00:01:18,010 --> 00:01:20,160
way. And this is also the level at which
27
00:01:20,160 --> 00:01:22,360
then we will apply validation and some other
28
00:01:22,360 --> 00:01:25,770
testing techniques like stress testing or robustness testing and
29
00:01:25,770 --> 00:01:29,890
so on. And as I said I'm not going to say anything more on this topic because
30
00:01:29,890 --> 00:01:32,760
we will cover verification, and validation, and testing in
31
00:01:32,760 --> 00:01:35,667
particular in great details in mini course number four.
|
