Plan how you would write instructions on putting on a jacket for someone who doesn’t already know how to do it, such as a small child (who can somehow already read), someone from a culture that doesn’t have jackets, or even an alien (as long as it’s roughly human-shaped).
Some things to consider in planning:
The reader
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What is the reader’s goal?
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What does the reader know about jackets?
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What does the reader not know about jackets? What of that will they need to know to put one on?
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What mental models do you use when you talk about jackets? Is your reader likely to share those models?
The document
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What is the purpose of this document?
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What scope limitations might there be on this topic?
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What is the reader’s starting point?
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What is the reader’s end point? When are they "done"?
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Are there other documents you might refer them to?
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Is there specialized vocabulary you want to use in this document?