Lecture 9-QMOOD

Question 1

Why was the QMOOD proposed?

Answer 1

For the assessment of high-level quality attributes in object-oriented designs.

Question 2

Why is the QMOOD useful?

Answer 2

It allows to assess the quality of a software system at design level(UML class diagram) without source code implementation.

Question 3

What are the 6 quality attributes ? (FEUFRE)

Answer 3

1) Functionality
2) Effectiveness
3) Understandability
4) Extendibility
5) Reusability
6) Flexibility

Question 4

What are the 11 QMOOD metrics ?

Answer 4

1) DSC(Design size in classes)
2) NOH (Nb of hierarchies)
3) ANA (Average nb of ancestors)
4) DAM (Data access metric)
5) DCC (Direct class coupling)
6) CAMC ( Cohesion among methods of class)
7) MOA (Measure of aggregation)
8) MFA (Measure of functional abstraction)
9) NOP (Nb of polymorphic methods)
10) CIS (Class interface size)
11) NOM (Nb of methods)

Question 5

Give the description, design property and system level aggregation of DSC.

Answer 5

-Nb of classes in design
-Design Size
-Sum

Question 6

Give the description, design property and system level aggregation of NOH.

Answer 6

-Number of class hierarchies in design
-Hierarchies
-Sum

Question 7

Give the description, design property and system level aggregation of ANA.

Answer 7

-Nb of classes from which a class inherits info
-Abstraction
-Average

Question 8

Give the description, design property and system level aggregation of DAM.

Answer 8

-Ratio : nb of private attributes/ total nb of attributes
-Encapsulation
-Average

Question 9

Give the description, design property and system level aggregation of DCC.

Answer 9

-Count of nb of classes that a class is directly related to.
-Coupling
-Average

Question 10

Give the description, design property and system level aggregation of CAMC.

Answer 10

CAMC = 1* count /kl :
-k : nb of methods
-l : nb of distance parameter types
-Cohesion
-Average

Question 11

Give the description, design property and system level aggregation of MOA.

Answer 11

-Count of part-whole relationships realized by attributes.
-Composition
-Sum

Question 12

Give the description, design property and system level aggregation of MFA.

Answer 12

-Ratio : nb of methods inherited / total nb methods inherited + defined
-Inheritance
-Average

Question 13

Give the description, design property and system level aggregation of NOP.

Answer 13

-Count of abstract methods
-Polymorphism
-Sum

Question 14

Give the description, design property and system level aggregation of CIS.

Answer 14

-Count of nb public methods
-Messaging
-Average

Question 15

Give the description, design property and system level aggregation of NOM.

Answer 15

-Count of all methods defined in a class
-Complexity
-Average