It is widely accepted that the issues of document coherence, and the avoidance of cognitive overhead, make the authoring of hypermedia documents difficult for user orientation and comprehension. Much current research aims to alleviate these problems by tailoring content and navigation options to individual users. OO provides a means of creating a modular framework for generating different, as opposed to singular, structures, enabling tailoring to different audiences. In this paper we present (part of) ExAM, an OO model that separates document concept-segments from the structure generating devices, providing a generic framework for structuring knowledge from any subject domain, according to any definable instructional techniques.