The Production Stage is the most important stage of communicative language teaching. Successful Production is a clear indication that the language learners have made the transition from "students" of the key language to "users" of the language.
One of the most important things to remember is that Production activities should not "tell" students what to say. Whereas in Practice the students had most or all of the information required, during Production they don't have the information and must think. Ideally it is challenging in that it is representative of "real life" situations.