How people find software bugs

In the software development environment, project managers, business matter experts, software developers, and software quality assurance experts can all find bugs in the software program.

Software developers find software bugs when:
a) Adding new code changes
b) Fixing a bug
c) Changing existing behavior
d) Reviewing code for refactoring
e) Reviewing code to improve performance
f) Code change peer review
g) Reviewing changes included in the most recent update