Discuss the notion of correctness and credibility. What does quot;credibilityquot; mean? What defines quot;correctnessquot;?

Discuss the notion of correctness and credibility. What does "credibility" mean? What defines "correctness"? What are some experiences you have had with written documents as the reader, or as the writer, where correctness influenced the credibility of the piece (email, memo, report, PowerPoint presentation, etc)? Provide an example or two of actual prose you have encountered that will demonstrate this issue. You can even research a bit on the web and bring some examples if you have none from your own experience as writer or reader. What are some ways you use to ensure correctness and credibility?