Some consequences:

• Helping students mean by "revision" something other than "fixing" or copying over in ink
• Helping students see why word choices matter, and not just for "correctness"
• Helping students read as though the meanings mattered (not as though there were going to be a test)
• Putting students in a position where something more than a mark depends on their ability to write comprehensibly what they've learned
• Giving students social motives for writing well