What type of contract addresses situations when the exact product or service annot be determined?

A contract that addresses situations when the exact product or service cannot be determined is typically known as an indefinite or open-ended contract. This type of contract allows for flexibility regarding the specifics of the product or service, often outlining general terms and conditions while leaving details to be defined later. Such contracts are common in scenariOS like supply agreements or service contracts where requirements may evolve over time.