 About Our Web Surveys The Library uses various types of online forms and surveys to collect opinions and feedback from a random sample of visitors. Primarily, the Library uses the ForeSee Results' American Customer Satisfaction Index (ACSI) online survey on an ongoing basis to obtain feedback and data on visitors' satisfaction with various Library of Congress web properties. The ACSI survey invitation pops up for a random sample of visitors; it is voluntary and does not collect personal information. The Library may also use other third party forms and surveys allowing you to provide feedback. All information you submit is voluntary. 