The evolution of language is a long-standing puzzle for many reasons. One is that its very virtues as a system of communication seem to open the door to ruinous free-riding and deception. This paper will locate and partially solve that problem within a framework explaining the evolution of honest signals and informational co-operation in human evolution, and will use that framework to develop a partial picture of language evolution. Presented by Kim Sterenly (Philosophy, Australian National University). Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/