Identify one requirement for informed consent in research.

Informed consent is a fundamental ethical requirement in research involving human subjects. One key aspect of informed consent is that participants must be provided with adequate information regarding the study. This information typically includes the purpose of the research, the procedures involved, potential risks and benefits, and the rights of the participants, including their right to withdraw at any time without penalty.

Providing clear and comprehensive information ensures that participants can make an informed decision about their involvement in the study, reflecting the respect for autonomy that is central to ethical research practices. This requirement is crucial for fostering trust and ensuring that participants' rights are safeguarded throughout the research process. Other factors, such as age limits or psychological evaluations, while potentially relevant to specific studies, do not universally apply to all contexts of informed consent. Similarly, having participants sign a contract does not fulfill the ethical obligation of adequately informing them.