Content Design
Letter CDesigning content so it can be understood, found, and used: language, piece structure, and the decision of what to say.
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Working definition
Content design treats content as a design object: what to say, in what order, with which words, so someone can complete a task.
It meets Information Architecture in labeling and taxonomy: a category name is a content decision as much as a structural one.
Distinction
IA decides which things exist and how they relate. Content design decides how those things are expressed when someone finds them.