Briefly, the design inference (the method rather than the book) identifies two features as essential for eliminating chance: improbability and specification.
Rational agents often detect the prior activity of other designing minds by the character of the effects they leave behind.
Bill Dembski pointed out that design detection, far from being an esoteric inference, lay in fact at the center of many normal human inquiries and activities.
William Dembski accurately formalized a filter we use so often that we’re like fish in the sea.
What is it, metaphysically one might say, that distinguishes design in the ID sense from ubiquitous teleological design, in a Thomistic sense?