This International Standard establishes a common framework for software life cycle processes, with well defined terminology, that can be referenced by the software industry. It contains processes, activities, and tasks that are to be applied during the acquisition of a software system, product or service and during the supply, development, operation, maintenance and disposal of software products. This is accomplished through the involvement of stakeholders, with the ultimate goal of achieving customer satisfaction. This International Standard applies to the acquisition of software systems, products and services, to the supply, development, operation, maintenance, and disposal of software products and the software portion of any system, whether performed internally or externally to an organization. Software includes the software portion of firmware. Those aspects of system definition needed to provide the context for software products and services are included. This International Standard also provides processes that can be employed for defining, controlling, and improving software life cycle processes within an organization or a project. The processes, activities and tasks of this International Standard may also be applied during the acquisition of a system that contains software, either alone or in conjunction with ISO/IEC/IEEE 15288, Systems and software engineering—System life cycle processes. In the context of this International Standard and ISO/IEC/IEEE 15288, it is recognized that there is a continuum of human-made systems from those that use little or no software to those in which software is the primary interest. It is rare to encounter a complex system without software, and all software systems require physical system components (hardware) to operate, either as part of the software system of interest or as an enabling system or infrastructure. Thus, the choice of whether to apply this International Standard for the software life cycle processes, or ISO/IEC/IEEE 15288:2015, Systems and software engineering-System life cycle processes, depends on the system of interest. Processes in both standards have the same process purpose and process outcomes, but differ in activities and tasks to perform software engineering or systems engineering, respectively.