This document explains why ISO/IEC selects "Shall" and "Shall not" rather than "Must" and "Must not" to denote mandatory requrrments.
"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 defnition 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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