This document specifies a core set of vocabulary, concepts and principles associated with the architecture practice for various kinds of entities, including enterprise, business component, capability area, mission, system, systems of systems, family of systems, infrastructure, product (goods or services), product line, service offering, software, technology and business domain. The vocabulary, concepts and principles apply within the context of: - organizations that develop architecture; - organizations that deliver enterprise constructs wider than, aligned with, or within the parent organization; - organizations seeking sustained success through the implementation of architecture practice; - organizations and interested parties seeking to improve communication through a common understanding of the vocabulary, concepts and principles used in architecture description; - organizations performing conformity assessments against the requirements of architecture-related standards and specifications; - providers of architecture descriptions, guidelines, training, education, evaluation or recommendations in architecture practice; - developers of architecture-related standards, architecture description languages, architecture modelling languages, reference architectures, reference models related to architecture, architecture frameworks and architecture-related tools and technologies.