A OVERVIEW ON TOPIC COHESION AND COUPLING.. I HOPE YOU WILL UNDERSTAND TOPIC EASILY...

1. -By SAURAV SONY

2.  Coupling
 Highly Coupled
 Loosely Coupled
 Uncoupled
 Types Of Coupling
 Cohesion
 Types Of Cohesion
Jagnesh
Chawla(jagneshchawla@gmail.com)

3.  Coupling is measure of the independence of
components.
 Coupling is related to cohesion.
 It is an indication the strength of inter
connections between the components in a
design .
Jagnesh
Chawla(jagneshchawla@gmail.com)

4.  These types of systems have interconnections ,
with program units dependent on each other.
Jagnesh
Chawla(jagneshchawla@gmail.com)

5. Highly coupled:
Jagnesh
Chawla(jagneshchawla@gmail.com)

6.  Loosely coupled systems are made up of
components which are independent or
almost independent.
 In this less dependences are available.
Jagnesh
Chawla(jagneshchawla@gmail.com)

7. Loosely coupled:
Jagnesh
Chawla(jagneshchawla@gmail.com)

8.  Uncoupled components have interconnections
at all.
 No Dependencies
Jagnesh
Chawla(jagneshchawla@gmail.com)

9. Uncoupled:
Jagnesh
Chawla(jagneshchawla@gmail.com)

10. Jagnesh
Chawla(jagneshchawla@gmail.com)
Content coupling
Common
coupling
Control coupling
Stamp coupling
Data coupling
Uncoupled
Low
Loose
High coupling

11.  When one component actually modifies
another .
 Then the modified component is completely
dependent on the modifying one.
Jagnesh
Chawla(jagneshchawla@gmail.com)

12. Jagnesh
Chawla(jagneshchawla@gmail.com)

13.  We can reduce the amount of coupling
somewhat by organizing our design so that
data are accessible from a common data store.
Jagnesh
Chawla(jagneshchawla@gmail.com)
Component
X
Change V1
To zero
Component
Y
Increment
V1
Component
Z
V =V2+A
Global:
A1
A2
A3
Variables:
V1
V2
T T

14.  When one component passes parameters to
control the activity of another component.
 We say that there is control coupling between
the two.
Jagnesh
Chawla(jagneshchawla@gmail.com)

15.  When data structure is used to pass
information from one component to
another.
Jagnesh
Chawla(jagneshchawla@gmail.com)

16.  If only data are passed, the components
are connected by data coupling.
Jagnesh
Chawla(jagneshchawla@gmail.com)

17.  The cohesion of a component is a measure
of the closeness of the relationship between
its components.
Jagnesh
Chawla(jagneshchawla@gmail.com)

18.  The worst degree of cohesion, coincidental is
found in a component whose parts are
unrelated to one another.
Jagnesh
Chawla(jagneshchawla@gmail.com)

19.  It is the next higher level of cohesion , where
several logically related functions or data
elements are placed in same component.
Jagnesh
Chawla(jagneshchawla@gmail.com)

20.  Sometime a component is used to initialize
a system or a set variables.
 Such a component performs several
functions in sequence ,but the functions
are related by the timing involved, so its
cohesion is temporal.
Jagnesh
Chawla(jagneshchawla@gmail.com)

21.  When function are grouped together in a
component just to ensure this order the
component is procedurally cohesive.
Jagnesh
Chawla(jagneshchawla@gmail.com)

22.  Communicationally cohesion often destroys
the modularity and functional independence
of the design.
Jagnesh
Chawla(jagneshchawla@gmail.com)

23.  If the output from one part of a component
is input to the next part the component has
sequential cohesion.
Jagnesh
Chawla(jagneshchawla@gmail.com)

24. Jagnesh
Chawla(jagneshchawla@gmail.com)