Information Technology Reference
In-Depth Information
Studiability
is a characteristic which allows minimisation of efforts in studying
and understanding software programs and documentation and includes
informativeness, clearness, structuredness and readability.
Within the scope of four formulated characteristics, one of three software
products conventionally named as "A", “В” and "C" is selected to analyze
financial standing of an enterprise.
For an evaluation of their characteristics the following scales are used:
•
Price — "low", "mean", "high";
•
Modifiability — "low", "mean", "high";
•
Studiability — "low", "mean", "high";
Completeness
•
—
"incompleteness",
“partial
completeness”,
“basic
completeness“, "complete completeness".
Based on the results of the software manufacturer price policy study, COSS was
constructed with membership functions of terms:
() (
)
1
1
μ
x
≡
2000
;
2500
;
0
500
;
() (
)
() (
)
1
3
μ
1
2
x
≡
3000
;
3500
;
500
;
500
μ
x
≡
4000
;
5000
;
500
;
0
;
.
Membership
()
()
()
functions of COSS terms “modifiability” are denoted by
,
,
,
μ
2
1
x
2
2
μ
2
3
x
μ
x
()
()
()
3
3
μ
3
1
x
μ
3
2
x
μ
x
accordingly, terms “studiability” - by
,
,
, accordingly, and terms
()
()
()
"completeness" - by
, accordingly.
Customer survey has yielded following outcomes: if “low price, high
modifiability, high studiability, and completeness available” or “low price, high
modifiability, high studiability, and basic completeness available”, or “low price,
mean modifiability, high studiability, and completeness available” or “low price,
high modifiability, mean studiability, and completeness available” or “low price,
high modifiability, high studiability, and completeness available”, or “low price,
high modifiability, high studiability, and basic completeness available”, or “low
price, high modifiability, mean studiability and completeness available”, or “low
price, mean modifiability, high studiability and completeness available”, the
software is thought proper for purchase.
Eight fuzzy selection (conclusion) rules are included in the customer
formulated preference. In total, there are 108 such rules as four characteristics are
considered, one of which has four linguistic values, and each of three other has
three values.
Outcomes of system from eight selection rules are degrees of considered
software membership to fuzzy set “the software which is thought proper for
purchase”. When operating with COSS terms membership functions, the
conjunctions "and" and “or" are treated as operations “min” and “max”,
accordingly.
Experts have estimated software products "A", "B", "C" and have obtained the
following outcomes:
()
4
1
,
,
4
3
μ
x
μ
4
2
x
μ
x
()
()
()
()
μ
1
1
A
=
0
68
μ
1
2
=
0
32
μ
1
1
=
0
74
1
2
1
1
A
B
μ
B
=
0
26
μ
C
=
0
46
;
;
;
;
;
()
()
()
()
()
2
2
2
3
2
2
μ
2
3
B
=
0
μ
A
=
0
μ
A
=
0
4
μ
B
=
0
μ
1
2
C
=
0
54
;
;
;
;
;
()
()
()
()
()
3
2
μ
2
2
C
=
0
μ
2
3
C
=
0
3
2
μ
3
3
A
=
0
6
μ
B
=
0
μ
A
=
0
4
;
;
;
;
;
