In June, the percentage of U.S. workers engaged at their jobs remained steady at 31.9 percent, according to a Gallup poll. This most recent figure is consistent with measurements from most of the year with the exception of February, when engagement hit a three-year high of 32.9 percent. Engagement levels varied by job type, but Gallup has shown the most engaged group of workers is managers, executives, and officers. In June, 40.4 percent of individuals in these roles reported they were engaged. The groups with the lowest levels of engagement were construction and mining workers (28.3 percent) and service workers (28.1 percent). While engagement levels have not grown significantly in 2015, they are higher than they were from 2011 to 2013. The reason for this isn’t clear, but Gallup suggests it could be that the more positive employment situation in the United States is contributing to higher levels of job satisfaction and engagement. The polling organization has shown that improvements in engagement levels usually coincide with reductions in unemployment and underemployment levels. Gallup has also pointed out the cascade effect, a term used to describe situations where employee engagement is directly tied to managerial engagement.