Why Research Ethics Exists

The rules that govern research today were not written in the abstract. Each one is a response to real people who were harmed by researchers who believed their work was important enough to justify the cost. This lesson looks at that history plainly, not to shock, but because the safeguards only make sense once you see what they were built to prevent. By the end, the three principles that underpin every ethics review should feel less like bureaucracy and more like promises the field made after failing to keep them.

The studies that made the rules necessary

Three cases are taught again and again, because each exposed a different way that good intentions and scientific curiosity can override a person's dignity.

The Tuskegee Syphilis Study (1932–1972). The U.S. Public Health Service enrolled roughly 600 poor Black men in Alabama (about 400 of them already infected with syphilis) to observe the untreated course of the disease. The men were never told they had syphilis; they were told they were being treated for "bad blood." When penicillin became the standard cure in the 1940s, it was deliberately withheld so the observation could continue. The study ran for forty years and ended only in 1972, after a whistle-blower brought it to the press. Its exposure led directly to the law that created today's ethics-review system.

Milgram's obedience studies (1961–1963). Stanley Milgram told participants they were helping with a "learning" experiment and instructed them to deliver what they believed were escalating electric shocks to another person. There were no real shocks (the "learner" was an actor), but the participants did not know that, and about two-thirds continued to what they thought was a dangerous 450-volt level while an experimenter urged them on. Many showed genuine distress. The findings about obedience were influential, but the study relied on deception, exposed people to real psychological strain, and made it hard for participants to simply stop and leave.

The Stanford Prison Experiment (1971). Philip Zimbardo assigned students to play "guards" and "prisoners" in a mock prison. Some guards became abusive and the study, planned for two weeks, was halted after six days. For decades it was told as proof that ordinary people slide into cruelty under a bad system. Modern scrutiny has complicated that story: released recordings and interviews show guards were coached toward toughness, the sample was tiny and self-selected, Zimbardo ran the study while playing "prison superintendent," and later attempts to reproduce the effect (such as the BBC Prison Study) did not find the same slide. It remains a landmark — but today it is discussed as much for its methodological failures as for what it seemed to reveal, a reminder that a gripping result is not the same as a sound one.

From harm to code: the documents

After each scandal, the field wrote down a rule so the same harm could not hide behind the same excuse again. Three documents form the backbone:

• The Nuremberg Code (1947) emerged from the trials of Nazi doctors who had experimented on prisoners. Its first and most famous line makes voluntary, informed consent absolutely essential: a person must understand what they are agreeing to and be free to refuse.
• The Declaration of Helsinki (1964), from the World Medical Association, extended this to medical research generally: independent review of study protocols, weighing risks against benefits, and special care for those who cannot fully consent. It has been revised many times as norms have sharpened.
• The Belmont Report (1979), written in the United States after Tuskegee by a national commission, distilled research ethics into three principles that still frame every ethics review today.

The three Belmont principles

Almost everything an ethics committee asks can be traced to one of these three ideas. They are the lens for the rest of this course:

• Respect for persons: treat people as autonomous agents who decide for themselves, and give extra protection to those with diminished autonomy (children, prisoners, patients who cannot consent). In practice this becomes informed consent.
• Beneficence: do no harm; maximize the possible benefits and minimize the possible harms. In practice this becomes the risk–benefit assessment at the heart of every review.
• Justice: distribute the burdens and benefits of research fairly, so the people who bear the risks are not a different, more vulnerable group than the people who stand to gain. In practice this becomes fair selection of participants.

From principles to the rules you actually work under

Belmont is a philosophy document, and by itself it binds nobody. What binds researchers in the United States is the regulation written from it: 45 CFR 46, whose Subpart A was adopted in 1991 by fifteen federal departments and agencies at once, which is why it is universally called the Common Rule. Three further subparts add protections for groups the justice principle singles out: pregnant women, fetuses and neonates (Subpart B), prisoners (Subpart C), and children (Subpart D). Its first real overhaul in a generation took effect in January 2019, requiring consent forms to open with a concise summary of the key information, dropping continuing review for most minimal-risk work, and pushing multi-site projects onto a single committee.

Two things follow from that history which matter more than the citation. The first is that IRB is an American word. The same review happens nearly everywhere under other names (Research Ethics Committee, Human Research Ethics Committee, ethics board), asking the same Belmont-shaped questions on different paperwork, so a form that looks nothing like the U.S. one is not evidence of a lesser process.

The second is that regulation is only one of the two layers you work under. Your discipline's professional code is the other, and it reaches further than the law does. The APA's Ethical Principles of Psychologists and Code of Conduct, adopted in 2002 and amended in 2010 and 2017, opens with five General Principles, and holding them next to Belmont's three shows what a code adds. Beneficence is there, but paired with nonmaleficence: a standing duty to avoid harm, not merely to weigh it against benefit. Justice carries across, and so does respect for people's rights and dignity. Two have no Belmont counterpart at all, fidelity and responsibility and integrity, and integrity is where honest reporting lives. That is why questionable research practices, authorship disputes and fabricated results are ethics violations in their own right, even when no participant is harmed by any of them.

Walk the timeline

Select any moment below to read what happened and, for the documents, what it established. When you open one of the studies, watch which of the three Belmont principles it failed to honor. There is no score here; this is a history to sit with, not a game to win.