As a panelist, you may choose the studies you would like to participate in, however you will be required to meet the specific study criteria in a screener prior to enrollment. Screeners are typically sent online via an emailed link. Qualification is determined by specific inclusion and exclusion criteria for each study. Screeners are utilized to determine whether a panelist meets preliminary criteria; final determination is made by the study personnel. Preliminary live screening may also be necessary. You will be notified via email if you are selected for testing. Testing procedures will be described in full detail prior to prior to giving your consent to enroll in a particular study.