In an Agile process, the velocity of development and churning out releases at the end of every sprint will overwhelm a manual tester without some sort of automation. If a tester has to manually execute tests for new functions, verify bugs, and run the system through regression every two weeks…the pace will eventually wear the test team members out and cause defects to slip through. In Agile, poor quality is a small snowball at the top of a powder-covered peak; once the ball starts to roll downhill, gaining size and speed, the odds of bringing it back to the top of the mountain quickly drop to zero. The only way to stay on track is to take manual tests and automate as much as possible.
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