This report updates and extends the Economic Security Index (ESI), an integrated measure of the share of Americans who experience large declines in their “available household income”-their household income after paying for medical care and servicing their financial debts. Americans are still coming to grips with the effects of the “Great Recession” on their economic security. Despite a number of valuable examinations of the downturn’s effects, surprisingly little is known about the dynamic experiences of Americans as their economic standing has changed from year to year amid a turbulent economy. This report fills this gap.