The role of consultant outside the medical sphere ( where the term is used specifically for a grade of doctor ) can fall under one of two general categories : The overall impact of a consultant is that clients have access to deeper levels of expertise than would be feasible for them to retain in-house , and may purchase only as much service from the outside consultant as desired .
Thus , clients have access to deeper levels of expertise than would be feasible for them to retain in-house , and may purchase only as much service from the outside consultant as desired .