Introduction

HCI research involves human participants. People give their time, share their behaviors, reveal their frustrations, and sometimes disclose sensitive aspects of their lives. In return, researchers are obligated to protect participants from harm, respect their autonomy, and handle their data responsibly. This obligation is not only moral—it is also institutional and legal. Universities and research organizations require ethics review before any study involving human participants can begin. Journals and conferences require authors to confirm that ethical standards were met. Data protection laws (such as PDPA in Singapore and GDPR in Europe) impose legal requirements on how participant data is collected, stored, and shared.

Most research ethics frameworks trace back to the Belmont Report, which established three core principles:

Respect for persons: Treat participants as autonomous agents. Those with diminished autonomy (e.g., children, patients) require additional protection. In practice, this means obtaining informed consent.
Beneficence: Minimize harm and maximize benefit. The potential knowledge gained from the study must justify any risks or discomfort imposed on participants.
Justice: Distribute the benefits and burdens of research fairly. Do not recruit participants from vulnerable groups simply because they are convenient; ensure that the knowledge produced benefits the communities studied.

These principles apply to all HCI research—from a 10-minute usability test to a year-long field deployment. Moreover, HCI research raises ethical issues that extend beyond traditional laboratory studies:

Interaction logging can capture detailed behavioral traces without participants being fully aware of what is being recorded
Online experiments (e.g., A/B tests) may involve participants who never explicitly consented to being part of a study
Research on social computing may involve analysis of publicly posted content whose authors did not anticipate being research subjects
AI and algorithmic systems can produce unexpected or discriminatory outcomes during a study
Design interventions (e.g., persuasive technology, digital well-being tools) can influence behavior in ways participants may not anticipate

Being aware of these issues is the first step toward addressing them.

Informed Consent

Informed consent is the process of ensuring that participants understand what a study involves and voluntarily agree to participate. It is the most fundamental ethical safeguard. A valid consent process provides participants with:

Element	Description
Purpose	What the study is about (in plain language, not jargon)
Procedures	What the participant will be asked to do
Duration	How long participation will take
Risks and discomfort	Any foreseeable risks, including boredom, frustration, or minor stress
Benefits	What the participant or society may gain (be honest — often the only benefit is contributing to knowledge)
Compensation	Any payment, gift cards, or course credit
Confidentiality	How data will be stored, who will have access, and how it will be de-identified
Voluntary participation	The participant can withdraw at any time without penalty
Contact information	How to reach the researcher and the ethics board with questions or concerns

The appropriate form depends on the study context:

Written consent form: Standard for in-person lab and field studies. The participant reads and signs a document. Keep a copy for your records and provide one to the participant.
Online consent screen: For remote or web-based studies. The participant reads the information and clicks "I agree" before proceeding. Ensure the full consent text is shown (not buried behind a link) and that the participant can decline and exit.