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==IEC design issues==
The number of evaluations that IEC can receive from one human user is limited by [[user fatigue]] which was reported by many researchers as a major problem. In addition, human evaluations are slow and expensive as compared to fitness function computation. Hence, one-user IEC methods should be designed to converge using a small number of evaluations, which necessarily implies very small populations. Several methods were proposed by researchers to speed up convergence, like interactive constraing evolutionary search (user intervention) or fitting user preferences using a convex function (Takagi, 2001). IEC [[human-computer interface]]s should be carefully designed in order to reduce user fatigue.
However IEC implementations that can concurrenlty accept evaluations from many users overcome the limitations described above. An example of this approach is an interactive media installation by [[Karl Sims]] that allows to accept preference from many visitors by using floor sensors to evolve attractive 3D animated forms. Some of these multi-user IEC implementations serve as collaboration tools, for example [[HBGA]].
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