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Why not issue a few "standard" documents, so the consultants just have to
fill in the gaps? Meaning, if the documents they write are similar in
content, why not write one or several documents (or templates) which will
cover most of the content and only have to be modified? This would save you
time as you only have to proof-read the modified bits.
If the documents are all different this, of course, won't work.
However, if parts of the document are similar, you could create a template
with macros in it, which will insert these text bits?
Should this still not help, why not give training sessions to show people
how to write their reports?
Also, it might be an idea to ask them to run the spell (and grammar)
checker, before they give the document to you.