An important concern in web based educational environment is the task of designing and preparing learner assessment, which would enhance the learning process. Currently the majority of Computer Assisted Assessment tools provide an assessment of the learners, without an analysis of the adaptive content presentation. In this paper we propose a logicbased formalism to characterize adaptive content presentation according to learner assessment. Recent researches in Adaptive Educational Hypermedia Systems can be effectively used to specify an assessment framework able to present parts of online courses according to an accurate evaluation of the learner's current knowledge level. Course implementation through the standards IEEE LOM and IMS QTI permits the organization of the learning and the assessment content in units, offering multiple views on the material, by a separation of the content and its description and putting in place a self evaluation mechanism. KEYWORDS Adaptive Hypermedi...