As the parent or teacher, you already know to check your students' writing for quality of content and mechanics.  What else do you look for? 

• Is the writing concrete? Look for specific words ("farmer" rather than "man"; "raced" rather than "ran").

• Is it clear? Are there ambiguities or inconsistencies in thought or expression?

• Is it concise? Check for unnecessary words (shorten "in the event that" to "if").

• Is it gracious? Christian writing should avoid rude or slang terms.

• Does the writing contain good sentence structure and proper paragraph construction? Look for run-on sentences, subject/predicate agreement; paragraphs with more than one main idea.

• Do descriptions involve all five senses?

• Do homepage original stories have a resolution of the conflict in which the main character plays a significant part? Is dialogue age-appropriate?

• Do essays flow well and express well-thought-out ideas? Are opinions well-stated and backed up with facts and illustrations? It isn't enough to state an opinion; it must be fleshed-out with solid reasoning and enough information for the reader to fully understand.