We gather a circle of people who have a logical brain and personal experience - and the climber has to convince the circle; with respect to both the climber's ability to use the system safely - and the safety of the system as such. Our time starts with second foot off the ground - so we can take our sweet time with it. It generally works quite well, and we generally end up with a second circle watching, listening, asking questions, and learning. It also mirrors the collaborative approach to safety that is key in working aloft. It can and does get interesting because climbers do innovate; but at the end of the day you've got to convince the circle. What we've found in the past, and this has mostly been at open masters, is that the climbers appreciate the discussion - and on occasions have misdirected themselves with respect to their innovations (or on occasions with their normal mode of work). As a non-technician it is quite something to watch... and speaks volumes for the collaborative side of climbing.