I used this set of slides in a presentation I gave to an engineering audience.

1. Assessing software systems
Tudor Gîrba
www.tudorgirba.com

2. 2002

3. PhD
2002 2005

4. PhD PostDoc
2002 2005 2009

5. PhD PostDoc
2002 2005 2009
Consultant
.ch
eng
ww.sw-
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9. { {
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complex
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=
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10. complex, large
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12. = 250’000 lines of code

13. = 250’000 lines of code
* 2
= 500’000 seconds

14. = 250’000 lines of code
* 2
= 500’000 seconds
/ 3600 140 hours
~

15. = 250’000 lines of code
* 2
= 500’000 seconds
/ 3600 140 hours
~
/ 8 ~ 18 days

16. = 250’000 lines of code
* 2
= 500’000 seconds
/ 3600 140 hours
~
/ 8 ~ 18 days
/ 20 ~ 1 month

17. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
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{

18. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
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{

19. Metric Value
LOC 148‘760
NOM 14‘915
NOC 2’089
CYCLO 30‘073
CALLS 151287
FANOUT 85909
AHH 0.12
... ...

20. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

22. A God Class centralizes too much intelligence
Class uses directly more than a
few attributes of other classes
ATFD > FEW
Functional complexity of the
class is very high
AND GodClass
WMC ! VERY HIGH
Class cohesion is low
TCC < ONE THIRD
6
scu 200
Marine
Lanza,

23. Significant duplication goes beyond just one line
Duplication chain has at least a
size of two relevant exact clones
SDC ! 2x(FEW+1)+1
Exact clones are longer than a
few lines of code Significant Duplication
AND
Chain
SEC > FEW
Distance between clones is not
more than a few lines of code
LB quot; FEW
Significant standalone
exact clone
SEC > AVERAGE(LOC/Operation) Significant
OR
Duplication
6
scu 200
Significant Duplication Chain
Marine
Lanza,

24. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

25. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

28. How do programs look like today?

29. A picture tells
a thousand words

30. proximity

31. enclosure

32. connectivity

33. similarity

34. closure

35. continuity

36. A picture tells
a thousand words

38. es tell a
ot all ords
pictur
N
usand w
tho

39. System Complexity shows class hierarchies
03
asse 20
uc
anza, D
L

40. Distribution Map
shows properties
over structure
Ducass
e etal 200
6

41. Feature Map relates features to packages
7
etal 200
Greevy

42. CodeCity shows where your code lives
7
nza 200
La
Wettel,

43. and where your flaws live
8
0
ettel 20
W

44. Duplications shown side by side

45. fo
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46. {
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re
ve
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reverse engineering
fo
actual development
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{
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47. Hierarchy Evolution reveals evolution patterns
5
etal 200
Girba

48. Ownership Map reveals patterns in CVS
5
etal 200
Girba

49. Clone Evolution shows who copied from whom
6
etal 200
Balint

50. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

51. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

52. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

53. e.ch
unib
se.
o
mo

54. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

55. ment is
assess
oftware
S
cy tools
han fan
ore t
m

56. McCabe = 21
d
o
#isG
:
NOM =
lect
0
102 se
,00
...
ses
3
clas
75
=
C
LO
{ {
{
{
}
}
}
} }
{

57. Tudor Gîrba
www.tudorgirba.com
creativecommons.org/licenses/by/3.0/