1. Commercial data processing (CDP) involves using large mainframe computer systems to process large volumes of data, such as for airlines, supermarkets, and the national lottery. 2. There are several advantages to using computers for CDP over manual processing, such as faster order processing, fewer errors, and easier storage of customer information. 3. The data processing cycle involves data collection and preparation, data input, data processing and storage, and data output. Various methods are used for data input, such as barcodes, smart cards, and mark sense cards.