"People who require assistance," in other words, "if you need help," that is, help writing clearly and in plain language, check out the resources below. In the event that you, to cite an example, endeavor to discourse about the products of your company -- whoa, hold on there -- I mean, if you want to talk, say, about your company's products, why not do it simply and succinctly? (Thanks to the terrific Manage Your Writing for the inspiration)
Write For Your Reader, A Plain Language Handbook
