Agile methodologies improve the entire development process
Waterfall has proven to still be an effective approach to software development. This downstream process allows developers to hand off the code to quality assurance when its ready to be tested. Developers write code, pass it to QA and bugs flow back upstream until the software reaches the level of quality that is expected.
Fundamentally, Agile is supposed to be a more effective approach, but it is quite challenging to implement. Instead of developers completing code and passing it off, development and QA work together throughout the entire process; requirements, epics, features and testing.
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