The ISO/IEC Directives define the basic procedures to be followed in the development of International Standards and other publications.
There are, however, other documents containing guiding principles for standards development, which can also be found below.
Here are the official rules that state how to develop an ISO standard:
ISO/IEC Directives Part 1 and Consolidated ISO Supplement
Official procedures to be followed when developing and maintaining an International Standard and procedures specific to ISO
Here are some supplementary documents that may help guide the standards development process:
Cooperation with CEN (the Vienna Agreement)
Committees cooperating with CEN under the Vienna Agreement will need to refer to details on this agreement.
Here is some information about Guides, which provide advice to standards writers and national standards bodies: