Effects of animated presentations and practice were studied in a computer-based science lesson involving 55 fourth graders and 64 fifth graders. Results suggest that animated graphics can promote learning, and they demonstrate successful application of interactive graphics in the design of cognitively based practice activities. (SLD)

The assumption that learners are the best judges of learning needs in computer-assisted instruction was tested by assigning 55 eleventh graders to learner-control or program-control conditions. Results indicate that efficiency of the learner-control strategy cannot be taken for granted and emphasize the importance of prior knowledge. (SLD)