Usability testing participants are people who are asked to test a product or system for its ease of use. They can be anyone who is the target audience for the product, such as potential customers or users. However, participants who have prior experience with the product being tested or knowledge of its design and development may not be suitable as they may exhibit biased opinions or behaviors.

Keep in mind that it's crucial to follow these ethical principles while conducting usability testing to ensure the safety and well-being of participants:

• Informed consent: Before taking part in the study, participants must be fully informed about the study's nature, risks, and benefits. They must also give their informed consent.
• Voluntary participation: Participants shouldn't be forced or pressured to participate in the study. They must be free to withdraw at any time without any penalty.
• Confidentiality: Personal information of participants should be kept confidential and not be shared with anyone outside the research team.
• Debriefing: After the study, participants must be told about the study's purpose and allowed to ask questions.
• Respect for participants: Participants should be treated respectfully and with dignity throughout the study, and their beliefs and values should be taken into account.^[1]