Direct Manipulation Principle: As the complexity of the materials increases, the impact of direct manipulation (animation, pacing) of the learning materials on the transfer of knowledge also increases.

However, when the average student is engaged in higher-order thinking using multimedia in interactive situations, on average, that student's percentage ranking on higher-order or transfer skills increases by 32 percentile points over what the student would have accomplished with traditional learning.

In his inaugural attempt using the application, Ferriter posted VoiceThreads about a variety of topics online, encouraging students to comment on them voluntarily on their own time. He got dozens -- even hundreds -- of comments on each. It was a revelation. "I can basically extend my classroom," he says.

Ferriter says more students participate more actively in digital discussions than in the classroom. "You don't have to be the loud one or the popular one," he points out. When he asked his students about their online involvement, he said they cited the sense of safety: "They can think about their comments beforehand." They also liked the fact that any VoiceThread has multiple conversations going on at once. "In a classroom conversation, there's generally one strand of conversation going at any one time, and if you're bored by that particular strand, you're completely disengaged," says Ferriter.

Ferriter says more students participate more actively in digital discussions than in the classroom. "You don't have to be the loud one or the popular one," he points out. When he asked his students about their online involvement, he said they cited the sense of safety: "They can think about their comments beforehand."