If the managers fail to see advantages of testing approaches, that normally means they are not mature enough to understand the cost of defects. Most of our pro

If the managers fail to see advantages of testing approaches, that normally means they are not mature enough to understand the cost of defects. Most of our process/engineering effort is to prevent defects from happening as soon as possible, because they are costly. Simply put, if a dev costs $$/hour, and he spends a day fixing bugs, the bugs cost at the very least 8x$$, plus the cost of not doing more important stuff. Mature organisations understand the cost of defects (the later you fix, the bigger the effort) and the advantage of fixing them early. TDD is just a technique (just like proper architecture, proper process, clear analysis, etc) to prevent defects because they are costly. Run through a couple of defects that you may have found lately and make the calculations for the cost. Explain that if you lower the rate of defects, you dont spend as much. Finally show that TDD can lower the rate of defects.