LAOS: Layered WWW AHS Authoring Model and their corresponding Algebraic Operators

In this paper, we describe the design steps for WWW authoring of adaptive hypermedia via a five layer model. We argue that we need to introduce the goal and constraints model between the domain model and adaptation and user models, in order to be able to generate adaptive hypermedia on the fly and to actually implement the so often quoted re-usage paradigm. We also show the operators necessary to implement functionality at the different levels, and exemplify this layered construction with MOT, an adaptive hypermedia (in particular, courseware) authoring system we have built at the Eindhoven University of Technology.