{\rtf1\ansi\deff0\deftab360 {\fonttbl {\f0\fswiss\fcharset0 Arial} {\f1\froman\fcharset0 Times New Roman} {\f2\fswiss\fcharset0 Verdana} {\f3\froman\fcharset2 Symbol} } {\colortbl; \red0\green0\blue0; } {\info {\author Biblio}{\operator }{\title Biblio RTF Export}} \f1\fs24 \paperw11907\paperh16839 \pgncont\pgndec\pgnstarts1\pgnrestart Badre, A., M. Baranek, J. M. Morris, J. T. Stasko, and I. Tomek, "Assessing program visualization systems as instructional aids", \i Computer Assisted Learning, ICCAL '92\i0 , New York, Springer-Verlag, pp. 87?99, 1992.\par \par }