The Understanding America Study HRS Wave 4 surveys are the fourth series of HRS surveys that UAS respondents are invited to. This wave replaces the UAS HRS Wave 3 in UAS185-190. Respondents currently participating in that wave will continue to do so until every survey in the wave has been completed.

New respondents who have not participated in the UAS HRS Baseline yet as well as respondents who completed the UAS HRS Followup more than two years ago are invited. The following HRS surveys are administered in the UAS HRS Wave 4:

Note that the above list excludes the HRS 2020 sections H2 (mortgage crisis) and W (Internet use).