Speech Graffiti is a standardized interaction protocol for spoken dialog systems designed to address some common difficulties with ASR. We have proposed a strategy of shaping to help users adapt their interaction to match what the system understands best, thereby reducing the chance for misunderstandings and improving interaction efficiency. In this paper we report on an evaluation of our initial implementation of shaping in Speech Graffiti, noting that our baseline strategy was not as powerful as expected, and discussing proposed changes to improve its effectiveness. Keywords Spoken dialog systems, speech recognition, user interfaces ACM Classification Keywords H.5.2 User Interfaces