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Software Measurement

Software Measurement. Big and Lack of Cohesion. 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). BIG empirical. We want to measure people as BIG i.e. height and weight

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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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