Look for:
Has the student:
Enlist the help of an employer or professional in your field to give feedback on one or two written assignments.
You could give them the criteria which students were given for the assignment, but also ask them to give feedback from their own professional perspective. What works? What doesn't? Why? Then present a summary of the employer's feedback in class and expand on it by addressing some of the more frequently made 'mistakes', or weaknesses in student writing in that particular assignment.