Shoe size "Footwear - Sizing - Vocabulary and terminology"; currently in development are companion standards ISO/TS 19409 "Footwear - Sizing - Measurement of last dimensions" and ISO/TS 19410 "Footwear - Sizing - Inshoe measurement". The adult shoe sizes are calculated from typical last length, which is converted from foot length in mm by adding an allowance of two shoe sizes: where formula_13 is foot length in mm. Direct conversion between adult UK, European and Mondopoint shoe size systems is derived as follows: Exact foot lengths may contain repeating decimals because the formulas include division by 3; in practice, approximate interval steps of
ISO 860 ISO 860 ISO 860 "Terminology work – Harmonization of concepts and terms" is an ISO standard that deals with the principles which are the basis upon which concept systems can be harmonized and with the development of harmonized terminologies, in order to improve the efficiency in interlinguistic communication. This standard specifies a methodology for the harmonization of concepts, definitions, terms, concept systems, and term systems. It is a natural extension of ISO 704. The standard addresses two types of harmonization: concept harmonization and term harmonization. Concept harmonization means the reduction or elimination of minor differences between two or more closely