The goal of both is to detect mistakes, but the distinction between them is how this is achieved. Automated testing attempts to expose problems by executing the code, while reviews rely on "another set of eyes" to verify that it's correct. Two common methods for improving software quality are code reviews and automated testing. ![]() Although the report concluded that it is not practical to locate and remove all defects from an application, it stated that nearly 40% could be eliminated by an improved inspection and testing process. The report also confirmed what most developers already know: the difficulty and cost of fixing a problem grows dramatically throughout the development cycle. A 2003 report from the National Institute of Standards and Technology (NIST) calculated the total annual cost of bugs at nearly $60 billion. In addition to the consequences of system malfunction, software defects have a substantial financial cost. ![]() In the most extreme cases, the bug will cause system failure, as was the case in the massive blackout in the Northeast last summer. ![]() Usually these are minor typographical errors that will be caught at compile time, but others may remain undetected until the system is in production. Writing and maintaining complicated software is a difficult task, and every programmer inadvertently makes mistakes.
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