Execution Model and Authoring Middleware Enabling Dynamic Adaptation in Educational Scenarios Scripted with PoEML

The design of adaptive e-learning systems has been approached from differ- ent points of view. adaptive educational hypermedia (aeh) conceptual frameworks, usually decompose this problem into separate concerns: a user model (um), an adap- tation model (am), and a domain model (dm). regarding educational modelling languages (emls), they provide adaptation mechanisms such as the modelling of participants following conditional learning paths over a common content structure.the design of adaptive learning paths in emls (the adaptation model) is predefined during design-time, and no changes on it are allowed during run-time. in this paper we describe the support of dynamic adaptation features (run-time changes on models) using poeml (perspective-oriented eml) as modelling language, with focus on the execution model of the poeml engine and on a soa-based middleware used by authoring tools to invoke change primitives.