Cohesion & Coupling


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Cohesion & Coupling

  1. 1. Presentation OfSoftware engineering Topic : Cohesion & Coupling Jagnesh Chawla(
  2. 2. Contents : Coupling Highly Coupled Loosely Coupled Uncoupled Types Of Coupling Cohesion Types Of Cohesion Jagnesh Chawla(
  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(
  4. 4. Highly coupled These types of systems have interconnections , with program units dependent on each other. Jagnesh Chawla(
  5. 5. Highly coupled: Jagnesh Chawla(
  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(
  7. 7. Loosely coupled: Jagnesh Chawla(
  8. 8. Uncoupled Uncoupled components have interconnections at all. No Dependencies Jagnesh Chawla(
  9. 9. Uncoupled: Jagnesh Chawla(
  10. 10. The range of couplingmeasures: Content coupling High coupling Common coupling Loose Control coupling Stamp coupling Data coupling Low Uncoupled Jagnesh Chawla(
  11. 11. Content coupling: When one component actually modifies another . Then the modified component is completely dependent on the modifying one. Jagnesh Chawla(
  12. 12. JagneshChawla(
  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(
  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(
  15. 15. Stamp coupling: When data structure is used to pass information from one component to another. Jagnesh Chawla(
  16. 16. Data coupling: If only data are passed, the components are connected by data coupling. Jagnesh Chawla(
  17. 17. Cohesion: The cohesion of a component is a measure of the closeness of the relationship between its components. Jagnesh Chawla(
  18. 18. Coincidental: The worst degree of cohesion, coincidental is found in a component whose parts are unrelated to one another. Jagnesh Chawla(
  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(
  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(
  21. 21. Procedurally cohesion: When function are grouped together in a component just to ensure this order the component is procedurally cohesive. Jagnesh Chawla(
  22. 22. Communicationally: Communicationally cohesion often destroys the modularity and functional independence of the design. Jagnesh Chawla(
  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(
  24. 24. Thank you …… Jagnesh Chawla(