This document discusses different styles of mapping and their uses in instructional design. It identifies key information structures like rhetorical structure, text structure and sentence structure that underlie effective mapping. It analyzes two mapping styles - Novakian mapping and Hunter's infostructure mapping - and their information-related characteristics. It concludes by outlining four types of task constraints that can be used to guide learners' language use when mapping, including constraints on map size, link types, rhetorical devices and degree of abstraction. The constraints are presented as easily manageable elements for instructional design.