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Software Measurement

Explore empirical and numerical relation systems to measure attributes like height and weight, using Lack of Cohesion in Methods metric and Representation Condition in software design. Discuss scale types and transforming mapping.

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Software Measurement

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  1. Software Measurement Big and Lack of Cohesion

  2. Representational TOM • empirical relation system • (C,R) • numerical relation system • (N,P) • M maps (C,R) to (N,P) • representation condition • x<y => M(x)<M(y)

  3. BIG empirical • We want to measure people as BIG • i.e. height and weight • Empirically, if two people are the same height, the heavier is bigger • if two people are the same weight, the taller is bigger

  4. BIG numerical • Tuple: <ht, wgt> • Relationship

  5. BIG scale type

  6. BIG monotonicity

  7. BIG Representation Condition

  8. BIG other mappings

  9. LCOM Lack of Cohesion in Methods

  10. Metric 6: LCOM • Lack of Cohesion in Methods • Let Ii be the set of instance variables used by method i • Let P be set of pairwise null intersections of Ii • Let Q be set of pairwise nonnull intersections • LCOM = max( |P| - |Q|, 0 )

  11. What Abstraction? • Needs to highlight which attributes are used by which functions

  12. Mapping to Abs • How does class get mapped to abstraction?

  13. What transformations? • Add an attribute • Add a statement with attribute ref • Add a statement without attribute ref • Add a function

  14. Mapping Abs to Ans • What is the mapping from the abstraction to the answer set?

  15. Rep Condition • Does the mapping between the partial order on the abstraction and the answer set satisfy the representation condition (one way)?

  16. Scale Types • Which scale type is implied by the transformations, abstraction and mapping?

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