unit process

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,[https://www.iso.org/obp/ui/#iso:std:iso:14040:ed-2:v1:en:term:3.34 ISO Online Browsing Platform (OBP)-ISO 14040:2006(en)] a unit process is defined as "smallest element considered in the life cycle inventory analysis for which input and output data are quantified".