164 lines
3.8 KiB
Plaintext
164 lines
3.8 KiB
Plaintext
1
|
|
00:00:00,430 --> 00:00:06,300
|
|
Hi, in the last lesson we provided an overview of the course and motivated the
|
|
|
|
2
|
|
00:00:06,300 --> 00:00:09,570
|
|
need for software engineering. In this lesson,
|
|
|
|
3
|
|
00:00:09,570 --> 00:00:13,090
|
|
we will present and start discussing several traditional
|
|
|
|
4
|
|
00:00:13,090 --> 00:00:16,090
|
|
software engineering life cycle models. We will
|
|
|
|
5
|
|
00:00:16,090 --> 00:00:18,790
|
|
talk about their main advantages, and also about
|
|
|
|
6
|
|
00:00:18,790 --> 00:00:21,840
|
|
their shortcomings. We will also talk about
|
|
|
|
7
|
|
00:00:21,840 --> 00:00:25,720
|
|
classic mistakes in software engineering that is well
|
|
|
|
8
|
|
00:00:25,720 --> 00:00:29,530
|
|
known ineffective development practices, that when
|
|
|
|
9
|
|
00:00:29,530 --> 00:00:32,590
|
|
followed, tend to lead to better results. And
|
|
|
|
10
|
|
00:00:32,590 --> 00:00:35,120
|
|
covering those, will hopefully help us to avoid
|
|
|
|
11
|
|
00:00:35,120 --> 00:00:38,350
|
|
them in the future. And because in this
|
|
|
|
12
|
|
00:00:38,350 --> 00:00:41,290
|
|
lesson, I will discuss some fundamental aspects of
|
|
|
|
13
|
|
00:00:41,290 --> 00:00:44,730
|
|
software engineering, to suitably introduce these topics, I
|
|
|
|
14
|
|
00:00:44,730 --> 00:00:47,110
|
|
went to the University of Southern California, to
|
|
|
|
15
|
|
00:00:47,110 --> 00:00:50,300
|
|
interview one of the fathers of software engineering;
|
|
|
|
16
|
|
00:00:50,300 --> 00:00:53,070
|
|
Professor Barry Boehm.
|
|
|
|
17
|
|
00:00:53,070 --> 00:00:59,060
|
|
>> A well, a software life cycle is a sequence of, of decisions that you
|
|
|
|
18
|
|
00:00:59,060 --> 00:01:01,895
|
|
make, and it's fundamentally those decisions are
|
|
|
|
19
|
|
00:01:01,895 --> 00:01:05,280
|
|
going to be part of the history of the
|
|
|
|
20
|
|
00:01:05,280 --> 00:01:09,500
|
|
software that. You are going to build that other people are going to use, and
|
|
|
|
21
|
|
00:01:09,500 --> 00:01:15,330
|
|
the process model is basically answering the question of what do I do next and
|
|
|
|
22
|
|
00:01:15,330 --> 00:01:20,550
|
|
how long shall I do it for. And again, because there are a lot of different ways
|
|
|
|
23
|
|
00:01:20,550 --> 00:01:24,220
|
|
you can make that decision, you need to
|
|
|
|
24
|
|
00:01:24,220 --> 00:01:27,640
|
|
figure out which models are good for which particular
|
|
|
|
25
|
|
00:01:27,640 --> 00:01:31,475
|
|
situations. So, for example, we've, written a book
|
|
|
|
26
|
|
00:01:31,475 --> 00:01:34,846
|
|
that's called Balancing Agility and Discipline. It says under
|
|
|
|
27
|
|
00:01:34,846 --> 00:01:37,835
|
|
what conditions should you use agile methods, under
|
|
|
|
28
|
|
00:01:37,835 --> 00:01:40,824
|
|
which conditions should you invest more time in analyzing
|
|
|
|
29
|
|
00:01:40,824 --> 00:01:44,826
|
|
the situation and planning what you're going to do and the like. And so,
|
|
|
|
30
|
|
00:01:44,826 --> 00:01:49,866
|
|
typically if the project is, is small where it's three to ten
|
|
|
|
31
|
|
00:01:49,866 --> 00:01:55,271
|
|
people, agile works pretty well. If it's 300
|
|
|
|
32
|
|
00:01:55,271 --> 00:02:00,545
|
|
people, then I think we don't want to go that way. If the affect of
|
|
|
|
33
|
|
00:02:00,545 --> 00:02:05,960
|
|
the defect is loss of comfort or limited funds, then agile is fine,
|
|
|
|
34
|
|
00:02:05,960 --> 00:02:11,184
|
|
but if it is a loss of life, then you don't. On the other hand if, if
|
|
|
|
35
|
|
00:02:11,184 --> 00:02:13,776
|
|
you have a situation where you have lot
|
|
|
|
36
|
|
00:02:13,776 --> 00:02:17,745
|
|
of unpredictable change, you really don't want to spend
|
|
|
|
37
|
|
00:02:17,745 --> 00:02:23,439
|
|
a lot of time writing plans and lots of documents. In some cases you may have a
|
|
|
|
38
|
|
00:02:23,439 --> 00:02:26,907
|
|
project where you want to do waterfall in
|
|
|
|
39
|
|
00:02:26,907 --> 00:02:31,140
|
|
some parts and agile in others. So, these are
|
|
|
|
40
|
|
00:02:31,140 --> 00:02:36,180
|
|
the kind of things that, that make the choice of life cycle process
|
|
|
|
41
|
|
00:02:36,180 --> 00:02:41,409
|
|
model very important and very interesting as a subject of research.
|