Page 58 - DCAP305_PRINCIPLES_OF_SOFTWARE_ENGINEERING

Principles of Software Engineering

Notes in the early stage of testing process; While Black Box Testing is conducted at the later stage to
verify the functional correctness of the program. Black Box Testing is also called as Behavioural
Testing or Partition Testing.
Object-Oriented Analysis

The principle of object-oriented examination is to develop solution models that satisfy the
customer requirement. The object oriented analysis generates model of the problem sphere of
influence. It represents classes, objects and interaction between objects. We use UML (unified
modeling language) to represent the analysis details. Use case diagram, class diagram, are used
to model the object oriented analysis using UML.
Object-Oriented Design

The object-oriented design converts the object-oriented analysis model into a design model. This
serves a draw-round for software building. Object-oriented design supports following object
oriented concepts such as abstraction, information hiding, functional independence, modularity.
Design is the initial step in moving towards from the problem domain to the solution domain.
A detailed design include specification of all the classes with its attributes, detailed interface.
The purpose of design is to specify a working solution that can be easily translated into a
programming language code.
The object-oriented design is classified into:

• Architectural design
• Detailed design
Architectural design

Architectural designs divide the system into dissimilar sub systems known as packages. Then
the dependence, relationship and communication between the packages are also identified.
Package diagram is use to represent architectural design using UML.
Detailed design

It describes the detailed description of the classes that is all the attributes (variables and functions).
The detailed class diagram represents the detailed design using UML.

Object-modelling technique (OMT) was introduces by Rumbaugh in 1994.

Be aware while changing names of object elements, the consistency of the
design is must be not affected.
Self Assessment Questions
1. ........................... is a white box testing technique that can be used to detect improper use
of data values due to coding errors.
(a) Software testing (b) Data-flow testing

(c) Static data-flow testing (d) Dynamic data-flow testing
2. The primary purpose of ........................ is to uncover possible bugs in data usage during
the execution of the code.
(a) software testing (b) data-flow testing
(c) static data-flow testing (d) dynamic data-flow testing

52 LOVELY PROFESSIONAL UNIVERSITY