When discussing performance with colleagues, teaching, sending a bug report or searching for guidance on mailing lists and here on SO, a reproducible example is often asked and always helpful.

This begs certain questions:

• What are your tips for creating an excellent example?
• How do you paste data structures from r in a text format?
• What other information should you include?
• Are there other tricks in addition to using dput(), dump() or structure()?
• When should you include library() or require() statements?
• Which reserved words should one avoid, in addition to c, df, data, etc?

Or, simply: How does one make a great r reproducible example?