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A unit process is one or more grouped unit operations in a manufacturing system that can be defined and separated from others.
In life-cycle assessment (LCA) and ISO 14040, a unit process is defined as "smallest element considered in the life cycle inventory analysis for which input and output data are quantified".
Life-cycle assessmentMethodology for assessing environmental impacts
Life-cycle engineering
ISO/IEC 12207ISO, IEC and IEEE standard for software lifecycle processes
ISO/IEC 15288Systems engineering standard on processes and lifecycle stages
ISO 19439International standard for enterprise modelling and enterprise integration
ISO 26262International safety standard for automotive electrical and electronic systemsText from Wikipedia, CC BY-SA 4.0 · Source article