There was once a study done by Philip Zimbardo on a group of teenagers in what is known as the Stanford Prison Study. That study resulted in serious mental disturbance among the participants and had to be called off before scheduled end of experiment. This study has raised many ethical issues. Imagine a child was to experience such a horrifying experience in which he/she will be scared mentally for life.
In this link, http://www.bera.ac.uk/files/2008/09/ethica1.pdf the author has drawn out an ethical guideline for education in dealing with children. Among the list is informed consent to the caretakers of the child, the right to withdraw at any given time of the study, incentives, privacy, disclosure, responsibility and acknowledgement.
It is a good guideline.
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