“Specified complexity” means that something is vastly improbable (complex), and it fits an independent pattern (specified). For instance, a child banging on a piano is complex, but it isn’t specified. Unless, of course, they are playing a coherent piece of music. Dembski explained that Leslie Orgel coined the term in his 1973 book The Origin of Life. Dembski, William A. The Design Revolution: Answering the Toughest Questions about Intelligent Design. Downers Grove, IL: InterVarsity, 2004. 81.