DM>>2. Update "Structure of this document" in Chapter 1 to say
DM>>that it treats all DoV in order, with an interlude about

DM>>umbrella specifications.

DHM>Partly done; I haven't introduced the notion of order there, since

DHM>we don't explain anywhere why the DoV are in such an order. Would
DHM>you mind drafting something for section 2?

=============== CURRENT VERSION (SOURCE) =====================
<H3><A id=structure name=structure>Structure of this document</A></H3>
<P>This document first introduces the concept of <A
href="http://www.w3.org/TR/2005/WD-spec-variability-20050428/#variability">dimensions
of variability</A>, and then analyzes specific aspects related to some of these
dimensions, more specifically the <A
href="http://www.w3.org/TR/2005/WD-spec-variability-20050428/#spec-cat-cop">classes
of products</A>, and the subdividing dimensions <A
href="http://www.w3.org/TR/2005/WD-spec-variability-20050428/#profile-module-level">profiles,
modules and levels</A>, extensions and optional features.</P>
==============================================================

I don't know if you want to keep all those forward links. If so, make the
obvious changes. As for the text, I propose...
========================== New version =======================
<H3><A id=structure name=structure>Structure of this document</A></H3>
<P>This document first introduces the concept of dimensions
of variability, and then analyzes specific aspects related to these
dimensions. Some of the dimensions are discussed in the
Specification Guidelines [<A
href="http://www.w3.org/TR/2005/WD-spec-variability-20050428/#SPECGL">SPECGL</A>]
and are briefly treated here. The rest are discussed in depth. The seven
dimensions are presented in a sequence from most to least independence from other
design factors. *After the seven dimensions,* there is a section discussing how
a Working Group might organize documents if variability is a factor encouraging
the issuance of a package of several documents.</P>
==============================================================

Notice the starred part at the end; this should be altered to describe the
placement of the Umbrella Specifications section. I wrote it as if that
section were to be placed after the last of the DoV, which I think is a good
place for it.
.................David Marston