This sounds interesting, but unfortunately I was unable to find any more significant information about the tests. It seems that it's mentioned in a few of Suga

This sounds interesting, but unfortunately I was unable to find any more significant information about the tests. It seems that it's mentioned in a few of Sugarman's books but that's it. In particular I'm interested in how controlled the tests were and how they measured productivity? Would I find this kind of detail in the books?