This paper describes the recently published technical specification ISO 16071 from the International Organisation for Standardisation (ISO), along with the process through which the document has been developed. ISO TS 16071 contains guidelines on designing accessible software. This paper also relates the activities within ISO to other ongoing standardisation activities, within for example W3C and ETSI. Scope, contents, guidelines and the definition of accessibility in ISO 16071 are discussed in relation to other definitions. Finally, the process of turning the technical specification into an international standard is discussed.