Thirty-six percent of workers report that promotions and bonuses are most likely to keep them engaged; however, only 27 percent of respondents say their employers offer these incentives while 28 percent of respondents say their companies even practice formal systems to recognize and reward employees, according to a study by Randstad U.S.

Just 16 percent of respondents consider performance reviews to be an effective way to encourage engagement, and this is the most commonly practiced employee engagement activity as 46 percent of respondents report that their companies conduct performance reviews.

Despite this, respondents do report that their companies practice some of the most effective engagement tactics. These include encouraging employees to share their ideas and opinions at 45 percent and investing in employees' careers through training, professional development and continuing education at 38 percent.