Sequential cohesion - Definition - Objects Design

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• Nirja Shah   -Posted on 16 Oct 15
  - Cohesion is a measure that defines the degree of intra-dependability within elements of a module.
  
  - The greater the cohesion, the better is the program design.
  
  - There are seven types of cohesion, viz
  
  Co-incidental cohesion
  - It is unplanned and random cohesion, which might be the result of breaking the program into smaller modules for the sake of modularization. - As it is unplanned, it may serve confusion to the programmers and is not-acceptable.
  
  Logical cohesion
  - When logically categorized elements are put together into a module, it is called logical cohesion.
  
  Temporal Cohesion
  - When elements of module are organized such that they are processed at a similar point in time, it is called temporal cohesion.
  
  Procedural cohesion
  - When elements of module are grouped together, which are executed sequentially in order to perform a task, it is called procedural cohesion.
  
  Communicational cohesion
  - When elements of module are grouped together, which are executed sequentially and work on same data (information), it is called communicational cohesion.
  
  Sequential cohesion
  - When elements of module are grouped because the output of one element serves as input to another and so on, it is called sequential cohesion.
  
  Functional cohesion
  - It is the highest degree of cohesion, and is highly expected.
  - Here, the elements of module are grouped because they all contribute to a single well-defined function.
  - It can also be reused.

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