Larry Cuban suggests " implementation of the device was hampered greatly by complicated software" and adds "IWBs inherently reinforce teacher-centered instruction at a time when the rhetoric among educators and school practitioners is student-centered instruction" (it's not just 'rhetoric' - I hate weasel words like this). But I have a better explanation, the evidence for which is the illustration accompanying the article. Tiny text. People just put up computer screens, or something similar, thereby creating the world's worst slide presentations. But to have text large enough to see al the way at the back of a 30+ student classroom, you need the surface area of a blackboard (or whiteboard). So the IRBs were pushed to the side, so real work could get done.
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