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Appendix 1 QUESTIONNAIRE. Please return before 1 March to Walter C. Hamilton Chemistry Department Brookhaven National Laboratory Upton, New York 11973 To Assist in the preparation of background material for the Symposium on Computing Needs and Resources in Crystallography, the organizers would be especially grateful if each member of the ACA (only one spokesman for each group) would complete and return this questionnaire at his earliest convenience. 1) Is your work primarily ( ) structure determination ( ) other (please specify) If structure determination, are the structures generally ( ) small ( ) medium ( ) large? 2) What model computer do you use for most of your crystallographic computations? If none, so state. 3) What is your real computing cost per year? $_ a) How much of this is from individual federal grants? $ b) How much from other grants? $_ c) How much is subsidized by your institution? $ 4) Please estimate the proportion of your computing costs devoted to a) Collection & preliminary processing of data % b) Direct methods, Patterson methods % c) Refinement % d) Other (please specify) % 5) How much do you expect your computer usage to increase a) By 1977 % b) By 1982 % 6) What is the computing cost of an average structure determination (if any) in your laboratory? $ 7) Have you-ever Yes No a) Carried out computations from a remote terminal? b) Made extensive use of computers not in your own institution? c) Used the ACA or lUCr program lists? 8) Do you feel that limitations on the quality or quantity of the computing available to you affect your work ( ) seriously ( ) moderately ( ) Slightly? 133