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Dear All Firstly, apologies for any cross-posting but I need a large number of people to help. Two colleagues and I are looking into the precision of estimating Joint Roughness Coefficient (JRC) by visual comparison with standard profiles. In order to carry out the study, we need to collect results of visual estimation of JRC from a large number of people. To do this, we have created an on-line survey which can be found at http://www.ex.ac.uk/~ajbeer/geomechanics/jrctest.htm We would be most grateful if you could spare a minute or two to complete the survey for us. There are five joint profiles to be assessed (randomly selected from 46) so it shouldn't take too long. Don't worry if you haven't done it before, as effect of level of experience is one of the things we're looking at. Full instructions for doing the survey are given on the website. Thank you for your help. Adam J. Beer Camborne School of Mines PS Those of you with longish memories will remember the previous pilot > survey, to which this is a follow-up.