Which level of Writing With Skill is right for my student?

According to the author, Susan Wise Bauer, middle-school students should start with Level 1 of Writing with Skill, which teaches the basic skills.  Each level of WWS forms the foundation for the next level. 

Dr. Bauer's book, The Well-Trained Mind, 4th Edition, covers this topic extensively.  If you have an older edition of the book, the following article will bring those editions up to date:  

Susan Wise Bauer expands on her recommendations for middle-school and gives direction for teaching writing at the high school level.