New leaders when inherit a group that is not enough hard working should take some time to listen and appreciate whatever the present situation is rather than imposing new norms to make their own mark. After assessing the situation, if the managers find the need for quick and fundamental change then they should address the problem systematically. The key to become an effective leader is to first get feedback from trusted sources. One should consult with his HR to ensure new standard doesn’t conflict with company policy. You can have a conversation with your peer managers and boss before addressing workgroup. While discussing business case the leader should be open to all ideas and shouldn’t come across as a resentful person. If any problem of transgression or insubordination arises, calmly and deliberately confront the behavior and impose appropriate consequences. Effective communication can raise the bar of your new team. Read more at https://hbr.org/2017/06/what-to-do-when-you-inherit-a-team-that-isnt-working-hard-enough