In revising the printed article for republication in the World Wide Web's hypertext format, I have

• added new headings,
  
  
• broken long paragraphs into shorter units,
  
  
• introduced bulleted lists, where appropriate,
  
  
• shortened some passages,
  
  
• moved a number of discussion passages into linked files,
  
  
• provided additional ways to navigate through the file by using links,

This version also includes several things that were not in the printed article:

• Cartoons on Teaching Styles
  
  
• Further discussion of some points,
  
  
• the complete text of a short followup article.

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