There is a growing body of evidence that the way organizations handle change is the biggest single cause of workplace negativity. For most of us, change automatically equals the loss of something comfortable, and we will resist it. We want to know why it's being made and want to be a part of the decision-making process. When we don't get input and answers, the seeds of negativity are sown. Listen for the first rumblings of discontent and take action.
All organizations go through change, but few talk about it with employees.
You will find most employees can deal with change more easily if they can talk about it openly. A negative person may be afraid of something. Teach negative employees to focus on offering solutions, not just criticism. If negativity seems rampant, hire a third party to conduct an anonymous survey to assess the problem. Do Some Coaching Work with the negative person on improving his or her attitude.