This paper reports findings from a project implementing the VL (virtual labs) site featuring

flash-based animations developed at Stanford University. The main conclusion in this paper stresses the need to

design for flexibility and adaptability of interactive media to better suit the specific situation teachers encounter in

their everyday work, in order to allow them to build their own audiovisual presentation kits based on various

available resources. Ambitious but rigid visualization products might otherwise end up not being used at all.