BBV, It wasn't me that organised & carried it out. It was Paul Miller for HiFi Choice.  He did have a fairly consistent methodogy which he applied whether it was cables, cd players or amplifiers under scrutiny. It was pretty comprehensively documented each time they published a group test he'd undertaken.  I'm sure if you can find a copy of Choice from the early 90's you'll get it chapter & verse. They were carried out blind though. The listeners did not know what they were listening to or what price it was. They always re-introduced items again during the test to check for consistency of opinion.  I look back with some horror to the tedium of those days!

Other than that, email him & ask him about the exact protocol used. He's the editor of HiFi News now so isn't exactly difficult to get hold of.

They don't do such thorough blind testing now.  Its just too expensive to organise.