Re: 2119bis

I offer for consideration the ISO and IEC  requirements for use of  the 
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 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

Directives, Part 2, Annex H.PDF
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