In order for studies to be accurate, every household must be given the chance to participate, including people with unlisted phone numbers. For many studies, a computer randomly generates the phone numbers that are called, or telephone numbers are obtained from public records. In other studies, researchers call customers of companies who want you to evaluate their product or service. In these cases, the client company provides your name and number. No matter how your number was selected, it will remain confidential to the researcher and will only be used for the specific project it was intended for.