In the 1990s, a few adventurous teacher education researchers enhanced video - based observation of video teaching cases by developing interactive
videodisc programs that required viewers to answer questions while viewing teaching episodes (e.g., Abell, Cennamo, & Campbell, 1996; Cronin & Cronin, 1992; McIntyre & Pape, 1993).
Net - Frog, a highly acclaimed interactive frog dissection
program that does away with formaldehyde, scalpels and squeamishness, was developed by Curry faculty members, first on
videodisc and then online.