IfSQ

39% of errors caused by interfacing

Research Finding:
39% of all errors are caused by internal interface errors / errors in communication between routines.

IfSQ Defect Indicators based on this finding:

• DP-1—Parameter Not Checked
  A parameter received by a program is used without first checking if its contents are present and within the expected range.
• DP-2—Status Ignored After Call
  Error status codes or exceptions from the run-time environment are suppressed or ignored, masking internal processing errors.

Source:

Software Errors and Complexity: An Empirical Investigation

• Victor R. Basili, and B.T. Perricone
• Recorded 1984 in Communications of the ACM, 27, no. 1, January
• Pages 42-52