... experimented on would know that what they were dealing with wasn't the real world. For example, no real dangers or decisions. This problem may be resolved by not informing people that they are being experimented on. This is full of ethical problems that cannot be overcome, as it is only fair that people should know they are being experimented on. That decision is left down to the researcher who has to decide how valid their results would be in a situation lacking realism. These are not the only ethical issues. The type of research being carried out may have a wider, or more long term affect on the subjects. For example, Rosenthal and Jacobson (1968) picked out random students from a school and told the teachers they would do well, supported by an exam which actually had no influence in the choosing of pupils. They went back years later to ...

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