It all started a week before, when the CTO of Damon’s midsize warehousing and transportation company in Northern California announced an innovative program to motivate employees and boost the quality of their logistics software. For every bug found by a tester and fixed by a programmer, both would get $10.

Everyone worked a bit harder the next day. Testers made sure to check and double-check every test case they ran, while developers worked through lunch to fix their assigned bugs. And it paid off. On that second day each had earned an average bonus of $50.

Everyone worked even harder on the third day. On the fourth day, however, the well had started to dry up. The testers ran, re-ran, and re-ran again the test cases, but they could only find a handful of issues. The developers strained the issue-tracking system, constantly reloading the “unassigned bugs” page and rushing to self-assign anything that appeared.

And then something strange happened at lunch. Instead of going out to eat with his usual teammates, one of the developers went out with a tester. Soon after, another developer went out with another tester. Within a few minutes, almost all of the developers had paired up with testers.

As the developers returned from lunch, they immediately got to work. Instead of scavenging for newly found bugs, they worked on “code refactoring” and new functionality. And as soon as they deployed their changes, testers found bugs — minor, obscure bugs that a developer could easily overlook. And just as quickly as testers found bugs, the developers were able to fix them and re-deploy. By the end of the day, developers and testers had earned an average of $120.