Where product requirements are changed, the manufacturer shall ensure that relevant documents are amended and that relevant personnel are made aware of the changed requirements. 7.2.3 Customer communication: The manufacturer shall determine and implement effective arrangements for communicating with customers in relation to— (a) product information; (b) enquiries, contracts or order handling, including amendments; (c) customer feedback, including customer complaints; and (d) advisory notices. 7.3 Design and development.