The textbook (link: https://open.lib.umn.edu/businesscommunication/chapter/4-3-good-writing/) mentions three additional qualities of good writing: 

(1) meets the reader’s expectations,
2) is clear and concise, 
and 3) is efficient and effective.

So, 

Choose a piece of writing that you have found on the internet (an article perhaps) that is business-related and that encapsulates the above qualities. 
Summarize and cite the source of the article. 
A portion of the article should be included within your discussion post.