The difference in tone is perhaps the most important between the two categories of writing. On one hand, technical writing emphasizes the instructions that it needs to send to its audience, which is why the tone of these instructions is usually brisk and short. The expository writing, because it is often a description, can often sometimes take even a literary tone in addressing the audience. It sometimes aims at linking causes and effects: like in the case with the annual report, the plan is not only to give out the facts, but also to explain the causality behind these and the things that have led to those effects and to those elements that can be improved in the future.

The tone of the writing actually gives the format as well. In the case of technical writing, the purpose of the writing (the necessity to give out a fast set of...
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