1. 1 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Chapter 24 Technical Metrics for Object-Oriented Systems

2. 2 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Distinguishing Characteristics  Localization—the way in which information is concentrated in a program  Encapsulation—the packaging of data and processing  Information hiding—the way in which information about operational details is hidden by a secure interface  Inheritance—the manner in which the responsibilities of one class are propagated to another  Abstraction—the mechanism that allows a design to focus on essential details Berard [BER95] argues that the following characteristics require that special OO metrics be developed:

3. 3 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Metrics for OO Design  Size  Complexity  Coupling  Sufficiency  Completeness  Cohesion  Primitiveness  Similarity  Volatility

4. 4 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Class-Oriented Metrics  weighted methods per class  depth of the inheritance tree  number of children  coupling between object classes  response for a class  lack of cohesion in methods Proposed by Chidamber and Kemerer:

5. 5 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Class-Oriented Metrics  class size  number of operations overridden by a subclass  number of operations added by a subclass  specialization index Proposed by Lorenz and Kidd [LOR94]:

6. 6 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Class-Oriented Metrics  Method inheritance factor  Coupling factor  Polymorphism factor The MOOD Metrics Suite

7. 7 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Operation-Oriented Metrics  average operation size  operation complexity  average number of parameters per operation Proposed by Lorenz and Kidd [LOR94]:

8. 8 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 Testability Metrics  encapsulation related  lack of cohesion in methods  percent public and protected  public access to data members  inheritance related  number of root classes  fan in  number of children and depth of inheritance tree Proposed by Binder [BIN94]:

9. 9 These courseware materials are to be used in conjunction with Software Engineering: A Practitioner’s Approach, 5/e and are provided with permission by R.S. Pressman & Associates, Inc., copyright © 1996, 2001 OO Project Metrics  number of scenario scripts  number of key classes  number of subsystems Proposed by Lorenz and Kidd [LOR94]: