A:Failure to warn is the claim that a manufacturer failed to provide directions for the safe use of a product or failed to warn the consumer against dangers inherent in product misuse. For example, a manufacturer who sells a painkiller without warning that use of the drug could impair the user’s ability to drive a car or operate machinery may be liable if the consumer is injured. Defective design is the claim that a product is, at the time it is sold, in a defective condition, making it unreasonably dangerous to the ordinary consumer. For example, a seller who designs a circular power saw that does not include a blade guard may be liable if the user suffers an injury from the unguarded blade.