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Presentation         OfSoftware engineering  Topic : Cohesion & Coupling                   Jagnesh                   Chawl...
Contents : Coupling Highly Coupled Loosely Coupled Uncoupled Types Of Coupling Cohesion Types Of Cohesion          ...
Coupling Coupling      is   measure      of    the  independence of components. Coupling is related to cohesion. It is ...
Highly coupled   These types of systems have    interconnections , with program units    dependent on each other.        ...
Highly coupled:                  Jagnesh                  Chawla(jagneshchawla@gmail.com)
Loosely coupled Loosely coupled systems are made up  of components which are independent  or almost independent. In   th...
Loosely coupled:                   Jagnesh                   Chawla(jagneshchawla@gmail.com)
Uncoupled Uncoupled components have  interconnections at all. No Dependencies                       Jagnesh             ...
Uncoupled:             Jagnesh             Chawla(jagneshchawla@gmail.com)
The range of couplingmeasures:          Content coupling      High coupling             Common              coupling      ...
Content coupling: When one component actually  modifies another . Then the modified component is  completely dependent o...
JagneshChawla(jagneshchawla@gmail.com)
Common coupling:   We can reduce the amount of coupling    somewhat by organizing our design so    that data are accessib...
Control coupling: When one component passes  parameters to control the activity of  another component. We say that there...
Stamp coupling:   When data structure is used to pass    information from one component to    another.                   ...
Data coupling:   If only data are passed, the    components are connected by data    coupling.                       Jagn...
Cohesion:   The cohesion of a component is a    measure of the closeness of the    relationship between its components.  ...
Coincidental:   The worst degree of cohesion,    coincidental is found in a component    whose parts are unrelated to one...
Logical cohesion:   It is the next higher level of cohesion ,    where several logically related functions    or data ele...
Temporal cohesion: Sometime a component is used to  initialize a system or a set variables. Such a component performs se...
Procedurally cohesion:   When function are grouped together in a    component just to ensure this order the    component ...
Communicationally:   Communicationally cohesion often    destroys the modularity and functional    independence of the de...
Sequential cohesion:   If the output from one part of a    component is input to the next part the    component has seque...
Thank you ……       Jagnesh       Chawla(jagneshchawla@gmail.com)
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Cohesion & Coupling

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Cohesion & Coupling

  1. 1. Presentation OfSoftware engineering Topic : Cohesion & Coupling Jagnesh Chawla(jagneshchawla@gmail.com)
  2. 2. Contents : Coupling Highly Coupled Loosely Coupled Uncoupled Types Of Coupling Cohesion Types Of Cohesion Jagnesh Chawla(jagneshchawla@gmail.com)
  3. 3. Coupling 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. 4. Highly coupled These types of systems have interconnections , with program units dependent on each other. Jagnesh Chawla(jagneshchawla@gmail.com)
  5. 5. Highly coupled: Jagnesh Chawla(jagneshchawla@gmail.com)
  6. 6. Loosely coupled 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. 7. Loosely coupled: Jagnesh Chawla(jagneshchawla@gmail.com)
  8. 8. Uncoupled Uncoupled components have interconnections at all. No Dependencies Jagnesh Chawla(jagneshchawla@gmail.com)
  9. 9. Uncoupled: Jagnesh Chawla(jagneshchawla@gmail.com)
  10. 10. The range of couplingmeasures: Content coupling High coupling Common coupling Loose Control coupling Stamp coupling Data coupling Low Uncoupled Jagnesh Chawla(jagneshchawla@gmail.com)
  11. 11. Content coupling: When one component actually modifies another . Then the modified component is completely dependent on the modifying one. Jagnesh Chawla(jagneshchawla@gmail.com)
  12. 12. JagneshChawla(jagneshchawla@gmail.com)
  13. 13. Common coupling: We can reduce the amount of coupling somewhat by organizing our design so that data are accessible from a common data store. Global: A1 A2 A3 Variables: V1 V2 Component Component Component X Y Z Change V1 Increment T T V =V2+A To zero V1 Jagnesh Chawla(jagneshchawla@gmail.com)
  14. 14. Control coupling: 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. 15. Stamp coupling: When data structure is used to pass information from one component to another. Jagnesh Chawla(jagneshchawla@gmail.com)
  16. 16. Data coupling: If only data are passed, the components are connected by data coupling. Jagnesh Chawla(jagneshchawla@gmail.com)
  17. 17. Cohesion: The cohesion of a component is a measure of the closeness of the relationship between its components. Jagnesh Chawla(jagneshchawla@gmail.com)
  18. 18. Coincidental: The worst degree of cohesion, coincidental is found in a component whose parts are unrelated to one another. Jagnesh Chawla(jagneshchawla@gmail.com)
  19. 19. Logical cohesion: 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. 20. Temporal cohesion: 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. 21. Procedurally cohesion: When function are grouped together in a component just to ensure this order the component is procedurally cohesive. Jagnesh Chawla(jagneshchawla@gmail.com)
  22. 22. Communicationally: Communicationally cohesion often destroys the modularity and functional independence of the design. Jagnesh Chawla(jagneshchawla@gmail.com)
  23. 23. Sequential cohesion: 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. 24. Thank you …… Jagnesh Chawla(jagneshchawla@gmail.com)

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