Chunyan Liu Georgios A. Dafoulas A Framework of Using Online Portfolio to Provide Learner and Learning Support in e-Learning. 18-22 2005 conf/icalt/2005 ICALT http://doi.ieeecomputersociety.org/10.1109/ICALT.2005.6 db/conf/icalt/icalt2005.html#LiuD05