&gt; What doesn&#x27;t work particularly well is encoding external knowledge explicitly. Having a semantic resource that tells you explicitly that &quot;fork&quot; and &quot;spoon&quot; are members of class &quot;cutlery&quot;. This has been tried by many people, and it produces small or no benefit.<p>I rarely do this, but … citation(s) please? Who has tried it, can you point too their results? Why hasn&#x27;t it worked, seems like totally the obvious solution for the next 7% gap. Why on earth wouldn&#x27;t it work?