A Critique of Grammatical Coverage in Business-Communication Textbooks  

Business English (BE) and business communication (BC) overlap. English handles linguistic mechanics and style, whereas communication holistically discusses the movement of a message from one person to another. The BC discipline, unfortunately, allows language basics into its pedagogy like a statistics course teaching fundamental mathematics. From the other side, some English courses teach BC before their students are able to handle that material. A subject teaches prepared students. If they are deficient, they are either kept out or the subject matter suffers.

Kenman, Leon F. Association for Business Communication (2004). Articles>Education>Grammar>Business Communication

Some Thoughts on Teaching Grammar to Improve Writing    

The conviction that writing can be improved with a knowledge of grammar has prevailed for quite a long time. But research has shown no correlation between grammatical knowledge and writing ability.

Baum, Bernard. CCC (1967). Articles>Education>Writing>Grammar

Teaching a Workshop on Sentence Diagramming  

Demonstrates how sentence diagramming can be an effective writing tool and offers tips on how it should be taught.

Jennings, Ann S. Intercom (2002). Articles>Education>Editing>Grammar