Intelligent design is modest in what it attributes to the designing intelligence responsible for the specified complexity in nature. For instance, design theorists recognize that the nature, moral character and purposes of this intelligence lie beyond the competence of science and must be left to religion and philosophy. Intelligent design, as a scientific theory, is distinct from a theological doctrine of creation. Creation presupposes a creator who originates the world and all its materials. Intelligent design only attempts to explain the arrangement of materials within an already given world. Design theorists argue that certain arrangements of matter, especially in biological systems, clearly signal a designing intelligence.
— William Dembski, from The Design Revolution, p. 42