This International Standard defines system engineering and management requirements for the life cycle of websites including strategy, design, engineering, testing and validation, and management and sustainment for Intranet and Extranet environments. This International Standard applies to those using web technology to present information and communications technology (ICT) information, such as user documentation for systems and software, life-cycle documentation for systems and software engineering projects, and documentation of policies, plans, and procedures for IT service management. This International Standard provides requirements for website owners and website providers, managers responsible for establishing guidelines for website development and operations, for software developers and operations and maintenance staff who may be external or internal to the website owner's organization. It applies to websites for public access and for limited access, such as for users, customers, and subscribers seeking information on IT products and services. The goal of this International Standard is to improve the usability of informational websites and ease of maintenance of managed Web operations in terms of: a) locating relevant and timely information, b) applying information security management, c) facilitating ease of use, d) providing for consistent and efficient development and maintenance practices. This International Standard is not intended for websites used primarily for marketing or sales, or to deliver instructional material, or to provide Graphical User Interfaces (GUI) for business or consumer transactional application processing. However, this International Standard may provide useful insights for managing such sites. This International Standard focuses on vendor- and product-independent considerations. It does not include specifications for application development tools, programming languages used for archiving site content or for presentation of content on the web, metadata tags, or protocols for web page design based on World Wide Web Consortium (W3C®) and related industry guidelines. It does not address tools or systems used for management or storage of information content (data, documents) that may be presented on websites. This International Standard does not address the design and architecture of software supporting the Internet.