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Generally, instrumentation either modifies [[source code]] or [[binary code]].
Instrumentation enables [[profiling (computer programming)|profiling]]: <ref>{{cite web|url=http://www.drdobbs.com/architecture-and-design/commenting-testing-and-instrumenting-cod/229300224|title=Commenting, Testing, and Instrumenting Code|work=Dr. Dobb's |date=January 3, 2011|accessdate=January 29, 2014}}</ref>
measuring dynamic behavior during a test run. This is useful for properties of a program that cannot be [[static program analysis|analyzed statically]] with sufficient precision, such as [[software performance|performance]] and [[alias analysis]].
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