IfSQ

High cohesion correlated to low fix cost

Research Finding:
Routines with low cohesion can cost 20 times more to fix than fixing highly cohesive routines.

IfSQ Defect Indicators based on this finding:

• SP-4—Module Not Cohesive
  Routines which are cohesive are typically easier to modify, easier to fix and contain less errors than routines with diverse tasks.

Source:

Analyzing Error-Prone System Structure

• Richard W. Selby, and Victor R. Basili
• Recorded 1991 in IEEE Transactions on Software Engineering, SE-17, no. 2, February
• Pages 141-52