TAILIEUCHUNG - Lecture Software engineering: Lecture 16 - Ivan Marsic

Lecture 16: Class cohesion metrics. The main contents of this chapter include all of the following: Structural cohesion metrics, internal cohesion or syntactic cohesion, external cohesion or semantic cohesion. | Ivan Marsic Rutgers University LECTURE 16: Class Cohesion Metrics Topics Structural Cohesion Metrics Internal Cohesion or Syntactic Cohesion External Cohesion or Semantic Cohesion Measuring Module Cohesion Cohesion or module “strength” refers to the notion of a module level “togetherness” viewed at the system abstraction level Internal Cohesion or Syntactic Cohesion closely related to the way in which large programs are modularized ADVANTAGE: cohesion computation can be automated External Cohesion or Semantic Cohesion externally discernable concept that assesses whether the abstraction represented by the module (class in object-oriented approach) can be considered to be a “whole” semantically ADVANTAGE: more meaningful An Ordinal Cohesion Scale 6 - Functional cohesion module performs a single well-defined function 5 - Sequential cohesion >1 function, but they occur in an order prescribed by the specification 4 - Communication cohesion >1 function, but on the same data (not

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