In electronic data interchange (EDI), a Qualifier is a code used to specify the type or format of data being transmitted within an EDI segment. A qualifier helps to define the meaning and context of the data, ensuring proper interpretation by the system of both sender and receiver.

Quality Function Deployment (QFD) is a systematic approach used in product development and operations management to translate customer requirements into specific technical features. QFD aims to ensure that the final product meets or exceeds customer desires, enhancing customer satisfaction.

Quick Response (QR) refers to an inventory management strategy that enhances the efficiency of information exchange between suppliers and customers. It allows for the rapid replenishment of stock by using electronic data interchange (EDI) technology to share real-time data on sales and inventory levels.