This document: ?? specifies the required processes implemented in the engineering activities that result in requirements for systems and software products (including services) throughout the life cycle; ?? provides guidelines for applying the requirements and requirements-related processes described in ISO/IEC/IEEE 15288 and ISO/IEC/IEEE 12207; ?? specifies the required information items produced through the implementation of the requirements processes; ?? specifies the required contents of the required information items; ?? provides guidelines for the format of the required and related information items. This document is applicable to: ?? those who use or plan to use ISO/IEC/IEEE 15288 and ISO/IEC/IEEE 12207 on projects dealing with man-made systems@ software-intensive systems@ software and hardware products@ and services related to those systems and products@ regardless of the project scope@ product(s)@ methodology@ size or complexity; ?? anyone performing requirements engineering activities to aid in ensuring that their application of the requirements engineering processes conforms to ISO/IEC/IEEE 15288 and/or ISO/IEC/ IEEE12207; ?? those who use or plan to use ISO/IEC/IEEE 15289 on projects dealing with man-made systems@ software-intensive systems@ software and hardware products and services related to those systems and products@ regardless of the project scope@ product(s)@ methodology@ size or complexity; ?? anyone performing requirements engineering activities to aid in ensuring that the information items developed during the application of requirements engineering processes conforms to ISO/ IEC/IEEE 15289.