Lots of parts, some dependent on each-other. ▪ Change one thing, another thing breaks, BUT YOU DON'T KNOW IT. ▪ End up in a constant treadmill of bug-fixing, testing, bug-fixing... until you reach the finish line, battered and bruised.
the feedback loop to seconds instead of days. ▪ The more you automate it; clicking links, typing values (etc) is the slow way. ▪ Aim for way to run the tests with a single click. ▪ More work upfront setting it up, but it pays off the larger the system gets.