Repetitive code indicates poor design

Research Finding:
Copy and Paste is a design error.

IfSQ Defect Indicators based on this finding:

• SPM-3—Copy/Paste Programming
  An identical or largely similar section of code appears in two or more places in a program or set of programs. Copy and Paste is considered by many industry experts to be a design error.

Source:

Why You Should Use Routines, Routinely

• Steve McConnell
• Recorded 1998 in IEEE Software, 15, no. 4, July/August
• Pages 94-95