I hire people who are recommended to me and I get contracted by people who recommended me. This has not changed since the first project I got (almost 30 years a

I hire people who are recommended to me and I get contracted by people who recommended me. This has not changed since the first project I got (almost 30 years ago; I was recommended by my high school physics teacher). If that is not enough, then I am not very interested; it definitely tells more about me than some test. And the other way around; I have never had to fire an engineer that was recommended this way to me. They were always great to work with.