terms "Shall" ; Shall not"; "Should"; "Should not" ; "May"; "Need not" ;
"Can'; "Cannot" in ISO and IEC standards.
This document explains why ISO/IEC selects "Shall" and "Shall not" rather
than "Must" and "Must not" to denote mandatory requirements.
"Do not use "must" as an alternative for "shall". (This will avoid any
confusion between the requirements of a document and external statutory
obligations.)"
It is in the interests of IETF to contemplate and perhaps reference this
ISO/IEC document somehow in our definition of the terms below
2.1. MUST . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. MUST NOT . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.3. SHOULD . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.4. SHOULD NOT . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5. MAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
George T. Willingmyre, P.E.
President, GTW Associates
Spencerville, MD USA 20868
301.421.4138
www.gtwassociates.com
Attachment:
Directives, Part 2, Annex H.PDF
Description: Adobe PDF document
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