The accuracy of technological forecasts, 1890–1940

Predictions of future technological changes and the effects of those changes, made by Americans between 1890 and 1940, are compared to the actual outcomes. Overall, less than half of the predictions have been fulfilled or are in the process of fulfilment. The accuracy of predictions appears at best weakly related to general technical expertise, and unrelated to specific expertise. One expert (or non-expert) appears to be as good a predictor as another. Predictions of continuing status quo are not significantly more or less accurate than predictions of change. Predictions of the effects of technology are significantly less accurate than predictions of technological changes.