I don't know how others do it. But here is what I do. I start by trying to work out what kind of problems the kind of contraption I am has to solve. And then I look for ways to solve those problems that are consistent with the capabilities of biological systems and consistent with the evidence. Regards, Neil WEB VIEW: http://tinyurl.com/ku7ga4 TODAY: http://alturl.com/whcf 3 DAYS: http://alturl.com/d9vz 1 WEEK: http://alturl.com/yeza GOOGLE: http://groups.google.com/group/Wittrs YAHOO: http://groups.yahoo.com/group/Wittrs/ FREELIST: //www.freelists.org/archive/wittrs/09-2009 I think you are expressing an utilitarian value.All symbols and system of symbols express nothing but a value for utility.Constructed relation between subject and object is the purpose.Achievement of purpose is not what LW indicate but the scheme underlying the design of purpose is shown.Usual mistakes committed by philosophers,intellectuals while trying to propose something new been shown by LW. thank yousekhar Yahoo! India has a new look. Take a sneak peek http://in.yahoo.com/trynew