An Analysis of Some Commercial PL/1 Programs
Finding relevant IfSQ Standards:
Missing "else" for 50-80% of plain "if"s
50% to 80% of plain "if" statements should have had an "else" clause
IfSQ Defect Indicators:
DP-3—Unexpected State Not Trapped
Part of a program that uses a value to switch between different branches does not trap unexpected cases.