New IEEE Standard - Superseded. Assurance-related terms are defined and an organized set of concepts and relationships to establish a basis for shared understanding across user communities for assurance are established in this adoption of ISO/IEC 15026-1. It provides information to users of the other parts of this International Standard including the combined use of multiple parts. The essential concept introduced by ISO/IEC 15026 is the statement of claims in an assurance case and the support of those claims through argumentation and evidence. These claims are in the context of assurance for properties of systems and software within life cycle processes for the system or software product. Assurance for a service being operated and managed on an ongoing basis is not covered in this International Standard.