1. What Left Shift Is It should be noted that “left” here is not the political left, standing for conservatism or radicalism, but the left that describes a process — moving things earlier in time. I first came across “left shift” while researching automated testing. The idea is appealing, and putting it into practice is simple.

1. What Agile Development Is In the traditional software development model, the cycle from raising a requirement to final delivery is long. The waterfall model proceeds through six steps: requirements analysis, design, coding, integration, testing, and maintenance. Once a requirement changes, the work invested earlier is not only wasted but also hard to adjust.