Dramaturgy in the broadest sense means giving feedback about how to improve a script. A dramaturg per se is to a playwright what an editor is to a novelist. However, unlike novels or poetry, theatrical scripts are written to be spoken aloud by actors and interpreted by directors and designers. As a consequence, the dramaturgical process--the process of making better scripts to create better theatre--usually involves many different theatre artists.
According to the old Webster's dictionary, etymologically, a "wright" is a person who makes, constructs or repairs, as in a "wheelwright" or "shipwright." This definition emphasizes the hands-on nature of writing for the theatre.
In the building of a ship, although the blueprint for construction is important, ultimately the ship has to get onto water. Once this happens, the shipwright sees how well a captain and crew might navigate the helm, how beautifully the sails will billow in the wind, and fundamentally, whether the ship will sink or sail.