U-3 is the headline unemployment number that we see in the news. It looks at those out-of-work Americans who have been looking for a job within the past four weeks. The more comprehensive U-6 includes everyone in U-3 plus those with only temporary work and people who are considered marginally attached to the labor force. These include those who have stopped looking for a job, as well as part-time workers unable to work full-time for economic reasons.