General discussion by Child, MS, Fluendy, M, Sutton, D, Jackson, WM, Hancock, G, Donovan, R, Addison, M, Butler, J, Gorry, P, Nowikow, C, Grice, R, Simons, J, Dixon, R, Freed, K, Fotakis, C, Martin, M, Ding, A, Trainer, M, Wanner, J, Clyne, M, Siska, P, Golde, M, Setser, D, Alexander, M, Dagdigian, P