The functional unit should as far as possible relate to the functions of the product rather than to the physical product. For example, rather “seating support for one person working at a computer for one year” than “one computer workstation chair”, rather “freezing capacity of 200 dm3 at -18°C” than “one 200 dm3 refrigerator”, rather “annual lighting of a work area of 10 square meters with 30 lux” than “bulbs providing 30,000 lumen for one year”. In this way, it is ensured that all obligatory properties - as well as the duration of the product performance - are addressed.
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