Apparently Don have not seen the many demonstrations and articles proving that see and avoid does not work (except in thermals when eye contact can be maintained to some extent).
Don, other then when thermaling and in the traffic pattern (which is only 20-30% of typical flight) you may as well fly blind folded and your chances for mid air will remain about the same. The problem is that many pilots believe that they can see and avoid since they always see traffic which is not on collision course without realizing that they can not see the one which will hit them. Also it will be interesting if we could put a camera in the cockpit of those claiming that they always scan to find out how much scanning they actually do during a 5 hours XC flight... Looking for lift under the clouds ahead is not considerd scanning!

Ramy