Indicates the collection and assessment of data on the input, output and potential impact on the environment of a product-system during its life cycle. It is an objective procedure used to assess the energy requirements and environmental impact of a process or activity that identifies and quantifies energy components, materials used and waste released into the environment. The assessment spans the entire life cycle of the process or activity, and includes the extraction and treatment of raw materials, manufacturing, transportation, use, reuse, recycling and final disposal.