So is the fault of the product user. The percentage of fault attributable to the product user will usually reduce the amount of money that person is entitled to receive equal to the percentage of fault. However, if your fault exceeds the fault of the manufacturer you probably won't be able to recover anything. Products liability claims can be based on negligence, strict liability, or breach of warranty of fitness depending on the jurisdiction where the claim is based. In any jurisdiction, a common denominator of any product liability case is the need to prove that the product is defective.
Design defects are inherent, they exist before the product is manufactured.
While the item might serve its purpose well, it can be unreasonably dangerous to use due to a design flaw. On the other hand, manufacturing defects occur during the construction or production of the item. Only a few out of many products of the same type are flawed in this case. Defects in marketing deal with improper instructions and failures to warn consumers of latent dangers in the product. Product Liability is generally considered a strict liability offense.