By,
Rahul
Object Oriented Design - Booch
Ø This
method designed by Booch represents the following four models :
a.
logical model : Defines class hierarchies. And key
abstractions.
b.
physical model : Defines the
concrete software and hardware compositions of the
system’s implementation.
c.
static model : Static associations in the system using
class diagram. Object
diagrams, module diagrams and process diagrams.
diagrams, module diagrams and process diagrams.
d.
dynamic model. : Dynamic associations in the system using state transition
diagrams and interaction diagrams.
diagrams and interaction diagrams.
Ø The whole methodology can be broken down into two processes viz :
a.
Macro development process :
i. Leads to the micro development process.
ii.More
concerned with the technical management of the system.
iii.Preserves the traditional phases of analysis and design. Thus consists
of following sub
phases :
1. Conceptualization : Establish the core requirements and the set
1. Conceptualization : Establish the core requirements and the set
of
goals meeting those requirements and design
a prototype.
2. Analysis and development : Use of diagrams for further clarity.
a prototype.
2. Analysis and development : Use of diagrams for further clarity.
First use the class diagram to understand the roles and responsibilities of the objects. Then use either object diagram or interaction diagrams to understand how those objects interact with each other and how do they achieve various functionalities in various scenarios.
i. Design: Use the class diagram and object diagrams drawn in previous phase to
decide the actual design of the system and various interactions between
classes.Use the module diagram to decide where to declare each class
and object.
And use process diagram to decide where to allocate a process.
ii. Evolution : Pass the system through various iterations to make the design better
by identifying designing flaws. Produce a release at the end of each
iteration such that each release is better than its previous one.
iii. Maintenance : Making localized changes to eliminate bugs and add new requirements
(if any).
b. Micro development process:
i. It is an integral part of Macro development
process.
ii. This is a description of day-to-day’s work and
tracking the activities of individual
users or a small group.
iii. It contains the following activities :
a. Identify classes and objects.
b. Identify semantics of the above
classes and objects.
c. Identify relationships among these
classes and objects.
d. Specify the interfaces and
implementation of the above classes.
