document: WEXTOR : a Web-based tool for generating and visualizing experimental designs and procedures WEXTOR is a Javascript-based experiment generator and teaching tool on the World Wide Web that can be used to design laboratory and Web experiments in a guided step-by-step process . It dynamically creates the customized Web pages and Javascripts needed for the experimental procedure and provides experimenters with a print-ready visual display of their experimental design . WEXTOR flexibly supports complete and incomplete factorial designs with between-subjects , within-subjects , and quasi-experimental factors , as well as mixed designs . The software implements client-side response time measurement and contains a content wizard for creating interactive materials , as well as dependent measures -LRB- graphical scales , multiple-choice items , etc. -RRB- , on the experiment pages . However , it does not aim to replace a full-fledged HTML editor . Several methodological features specifically needed in Web experimental design have been implemented in the Web-based tool and are described in this paper . WEXTOR is platform independent . The created Web pages can be uploaded to any type of Web server in which data may be recorded in logfiles or via a database . The current version of WEXTOR is freely available for educational and noncommercial purposes . Its Web address is http://www.genpsylab.unizh.ch/wextor/index.html
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