People hire consultants for professional advice.
Seeing a consultant implies no deficiency, only the client's desire to improve in the consultant's area of expertise. The means we use, however, distinguish our role from a teacher's in the writing process. For instance, since we simply do not know all that the student's teacher knows about her field, or about making arguments in that field, we encourage the student to articulate the expectations and standards of the assignment. From there we begin working on specific areas which the student, essentially, has designated. Our primary goal is to help students help themselves.