Working through the ISO community, it is the people who need the standards that decide. A particular industry or business sector can communicate its need for a standard to their national ISO member; the idea is then proposed to ISO as a whole.
If accepted, the project is assigned to an existing technical committee.
Proposals may also be made to establish technical committees to cover new scopes of technological activity. In order to use resources most efficiently, ISO only develops new standards for which there are clear market requirements.
If you feel there is a need for a standard in your sector, please contact your ISO member.