In theory, any manufacturer, designer, seller, distributor, lesser, or any party having any responsibility with placing the defective product “into the stream of commerce” may be held liable for injuries caused by a defective product. The specific individuals and corporations to include in a product liability claim takes extensive investigation and inspection prior to filing a product liability lawsuit. It is also helpful to investigate the specific cause of the defect prior to filing suit so that the appropriate parties can be included in any product liability lawsuit.