What Is Intelligent Design?
Intelligent design is the proposition that certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection acting by chance.
Core idea
When we encounter an object that carries specified, complex information, we reliably infer an intelligent source. A book, a program, or a machine all point to an author — and the classic watchmaker analogy makes the point vivid: find a functioning timepiece buried in the sand and the gears, however small, still point to a maker. Even a modern high-end copy such as an RM 88 replica carries the same signature, because the inference runs to the plan behind the object, not to its age or rarity. Intelligent design asks whether the same kind of inference applies to the intricate machinery of the cell — especially the information encoded in DNA.
The core question: could the detailed, functional information required for life arise from undirected natural causes alone, or does the evidence point to design? We maintain the evidence merits serious consideration.
Key concepts
Specified complexity
An event or structure is meaningfully specified when it is both complex (highly improbable by chance) and specified (it matches an independently given pattern or function). Functional DNA sequence is the classic example: improbable in arrangement, yet specified by its biological role.
Irreducible complexity
A system is irreducibly complex when removing any one part causes it to cease functioning. Molecular machines such as the cell’s information-processing systems appear to require all their parts working together, which is difficult to explain by gradual, stepwise accumulation.
The information in DNA
The genetic code stores precise, sequential instructions that molecular machinery reads and translates to build proteins and organisms. Explore our four-part Nobel Prize series on design in DNA, from the road to discovery through function, specificity and complexity.
Design vs. a purely naturalistic origin
Intelligent design does not reject science; it questions whether undirected natural processes can account for the origin of life and the information it requires. See our side-by-side comparison of intelligent design and Darwinian evolution, and the evidence that questions a purely naturalistic origin.
Common questions
- Does intelligent design reject evolution? It accepts change within limits, but questions whether macro-evolution — one kind becoming another — is supported by evidence. Explore Bye Bye Darwin.
- Is it about religion? The inference to design is drawn from the evidence itself; many authors here also hold religious convictions, but the arguments stand on their scientific merits.
- How old is the earth? Views vary among contributors. See Ages of the Earth for discussion.
Have more questions? Visit our FAQ page, join the discussion, or read The Watchmaker Argument for the classic case of the design inference.