Andrew E. Walker

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This paper reviews the literature surrounding an information filtering technique, collaborative information filtering, which supports the discovery of resources in a way that is sensitive to the context of users. Moreover, via statistical clustering techniques, the system supports automated, personalized filtering and recommendation of relevant resources(More)
This paper defines a model of teacher practice (" teaching as design "), and describes a professional development curriculum in which K-12 teachers design learning activities using resources and tools from education digital libraries. It then presents preliminary findings from an application of this model in which teachers' artifacts are analyzed to learn(More)
Over the past 10-15 years, educational digital libraries (DLs) have acquired online learning resources of varying levels of granularity (e.g., from images to entire lessons) and of varying sources of authorship (e.g., grant-funded subject matter experts; K12 teachers; graduate students). The challenge is to balance collecting and providing access to online(More)
This paper employs meta-analysis to determine the influence of computer-based scaffolding characteristics and study and test score quality on cognitive outcomes in science, technology, engineering, and mathematics education at the secondary, college, graduate, and adult levels. Results indicate that (a) computer-based scaffolding positively influences(More)
Assessing the quality of online educational resources in a cost effective manner is a critical issue for educational digital libraries. This study reports on the approach for extending the Open Educational Resource Assessments (OPERA) algorithm from assessing vetted to peer-produced content. This article reports details of changes to the algorithm,(More)
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