This document summarizes and analyzes three cases of ethical controversy in research studies: Stanley Milgram's obedience study, Laud Humphrey's tearoom study, and Philip Zimbardo's Stanford prison experiment. It discusses how each of these studies violated ethical principles like informed consent, risks of harm, privacy, and allowing subjects to withdraw. The document also outlines guidelines for addressing ethical issues in research processes, sites, data collection, and ensuring respect, beneficence and justice for participants.