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Electronic brainstorming (EBS) has been proposed as a superior approach to both nominal brainstorming (working alone) and face-to-face brainstorming (verbal). However, existing empirical evidence regarding EBS's superiority over nominal brainstorming is weak. Through a comprehensive examination of the process gains and process losses inherent to different brainstorming approaches, this paper explains past results. The paper also suggests that the process gain versus process loss advantages of EBS technologies may not be large enough to enable EBS groups to outperform nominal groups. In an effort to find alternate ways of using EBS more productively, three conditions thought to increase EBS's process gains and decrease its process losses (thus improving its productivity) are identified. A laboratory experiment designed to compare the productivity of ad hoc and established groups using four brainstorming technologies (nominal, EBS-anonymous, EBS-nonanonymous, verbal), generating ideas on socially sensitive and less sensitive topics, in the presence and absence of contextual cues, is then described. The results of the experiment showed that overall, groups using nominal brainstorming significantly outperformed groups using the other three brainstorming approaches. Further, even under conditions thought to be favorable to EBS, nominal brainstorming groups were at least as productive as EBS groups. The paper explains these results by suggesting that the process gains of EBS may not be as large as expected and that the presence of four additional process losses inherent to EBS technologies impair its productivity. It is also argued that the prevailing popularity of group brainstorming (verbal or electronic) in organizations may be explained by the perceived productivity of those approaches. These perceptions, which are at odds with reality, create the illusion of productivity. A similar misperception may also cause an illusion of EBS productivity in the research community, especially when perceptual measures of group performance are used.