This International Standard defines the Software Engineering Metamodel for Development Methodologies (SEMDM), which establishes a formal framework for the definition and extension of development methodologies for information-based domains (IBD), such as software, business or systems, including three major aspects: the process to follow, the products to use and generate, and the people and tools involved.This metamodel can serve as a formal basis for the definition and extension of any IBD developmentmethodology and of any associated metamodel, and will be typically used by method engineers whileundertaking such definition and extension tasks.The metamodel d