All of the situations you mentioned involve revision, but they serve different purposes. Here’s a breakdown:
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Removing spelling and punctuation errors - This is primarily a form of proofreading, which focuses on correcting surface-level mistakes to ensure the text is polished and error-free.
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Adding details to support an idea - This situation often requires substantive revision. If a writer identifies that an idea lacks support, it indicates that the argument or narrative may be weak and needs further development.
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Increasing sentence variety - This typically involves revising for style and readability. A writer may choose to revise to enhance the flow and engagement of the text.
Among these, adding details to support an idea most clearly indicates a need for significant revision. It reflects a deeper evaluation of the content, structure, and clarity of the writing.