How do large scale software companies (IBM, Micrsft, SAP) specify design?

I am wondering if anyone can point me to a reliable source of information that shows how large scale software companies perform business when it comes to Software design specifications?
Do they do a full design? Partial? No designs at all?
Do the companies do a high and low level design, or split it into different phases/iterations?
Do they use a proprietary format (Text + UML)? Straight UML? Text Only?
Does anyone know of a source of information which describes these sort of informations?
Thanks

Most will have a multitude of "standards" and"processes" in use in different departments and for
different projects.
I agree with you, but is there information out there
which points to what large companies tend to do during
the design phase? On large scale projects (10,000+
function points), it would be nearly impossible to
approach this task without dividing and conquering
(refer to Dr. Jenkings Extreme Software Cost
Estimation, which says that an individual task of
200,000+ lines of code can never be completed, or at
least has never been done).
Large scale projects exist without formal design. They usually arrive at that over time by incremental addition.
So, there must design approaches used, otherwise
these companies would never be finishing their
projects. So I am trying to find a source that I can
cite with information on specifically what design
process, and modeling is being used.Just because there are no formal designs or the formal designs are not up to date does not mean there are no designs.
The problem is not that designs do not exist, but rather that there is no way to communicate those designs to others. Formal, up to date designs, solve that problem.

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