Guarantees in a project aggrement give some degree of assurance to the buyer that the end product will meet the specified requirements, but they also represent potential future costs to the seller, or cost risk, if the system fail. The four express(as compared to implied) guarantee categories are: a scope, cost, schedule, quality b design, safety, fabrication, function c operational, functional, maintainability, repairability d design, workmanship, equiptment, performance(process)