Is this the same article that appeared in the Communications of the ACM? Not behind paywall, that's a plus. (http://dl.acm.org/citation.cfm?id=2699417&CFID=6128

Is this the same article that appeared in the Communications of the ACM? Not behind paywall, that's a plus. (http://dl.acm.org/citation.cfm?id=2699417&CFID=612805967&CFTOKEN=69304030 http://dl.acm.org/citation.cfm?id=2699417&CFID=612805967&CFT...)