Keith
A Proposed Standard specification is generally stable, has resolved
known design choices, is believed to be well-understood, has received
significant community review, and appears to enjoy enough community
interest to be considered valuable. However, further experience
might result in a change or even retraction of the specification
before it advances.
Usually, neither implementation nor operational experience is
required for the designation of a specification as a Proposed
Standard. However, such experience is highly desirable, and will
usually represent a strong argument in favor of a Proposed Standard
designation.
The IESG may require implementation and/or operational experience
prior to granting Proposed Standard status to a specification that
materially affects the core Internet protocols or that specifies
behavior that may have significant operational impact on the
Internet.
A Proposed Standard should have no known technical omissions with
respect to the requirements placed upon it. However, the IESG may
waive this requirement in order to allow a specification to advance
to the Proposed Standard state when it is considered to be useful and
necessary (and timely) even with known technical omissions.
Implementors should treat Proposed Standards as immature
specifications. It is desirable to implement them in order to gain
experience and to validate, test, and clarify the specification.
However, since the content of Proposed Standards may be changed if
problems are found or better solutions are identified, deploying
implementations of such standards into a disruption-sensitive
environment is not recommended.