How many levels of indents and heads are reasonable?

["Van Laan, Krista" <KVanlaan -at- verisign -dot- com>]

Are there any guidelines anywhere for what is a reasonable number of
headers and indents?

We have a page layout that includes a couple of outdented headers. Body
text is 3 levels of indentation, which causes the left alignment to be
in any of 5 places. Some of the team have expressed a desire for another
2 or 3 levels of indents. I am not sure how and why these would be used,
so I'd like to be open to this, but am interested in doing some research
before I make a recommendation.

I'm also wondering about current thinking on heading levels. Can it all
be done with 4 levels, or do we need 6 or more?

This layout will show up in online help and PDF documents. I'd
appreciate input but also references if possible.

Thanks,

 Krista Van Laan
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