Note: A sub-sample (N=5,742) of the Health and Retirement Study (HRS) participated in the 2009 Internet-based survey developed jointly by the HRS, Survey Research Center (SRC), and the Institute for Social Research (ISR) at the University of Michigan, and the RAND Corporation. The National Institute on Aging at NIH (R01 AG020638) provided funding to RAND with a subcontract to UM for the 2009 Internet Survey. The 2009 Internet Survey Final Release (Version 1.0) collected information on a number of topical areas including: health (physical and mental, health behaviors); psychosocial items; economics (income, assets, expectations, and consumption); and retirement. The 2009 Internet Survey is the fourth in a series of surveys conducted on the Internet. Completed interviews were obtained from 4,433 HRS respondents.