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Improving the quality and the usability of your software will greatly help to meet customer expectations and industry standards. This is where QA team comes into play.
Although Independent QA and development teams have the same goal of ensuring the security and quality of software, the impartiality of an independent QA sets them apart. Here is a comprehensive guide on why Independent Software Testing will give your software a competitive edge: https://www.telliant.com/making-the-case-for-independent-qa-teams/