When workplace whiners start sounding off, it can be as pleasant as nails on a chalkboard. "Our deadline is completely unrealistic." "These specifications are science fiction." "This place is so unfair." Constant negative comments can weigh down a team. They can even turn positive people into whiners themselves. So how do you stop the toxic talk while still showing respect for the source of those endless complaints? Here are five strategies:

-- Whiners have a way of drawing people into their negative vortex. Even positive people can feel the pull, especially if they want to show empathy for their complaining colleague. So be careful: When dealing with a workplace whiner, don't unwittingly become one!

-- Some whiners just want to vent, so give them a chance. Take five or so minutes from your schedule and let them go full blast explaining what's causing them so much heartburn. There's no need to agree with them. In fact, by agreeing, you just might fan the flames. Simply listen, ask a few questions, generate some light conversation, and leave it at that.

-- If the griping continues and your active listening gets you nothing but an earache, take the conversation one big step further. Ask the whiner to explain why he's complaining. Press for specifics. Try to uncover root causes. For instance, if he can't stop talking about "unfair policies," ask him to identify the specific policies he has in mind. Then ask him what's unfair about them. This exchange will either reveal that there's nothing behind the person's complaints -- or it will add clarity and detail to some very justified concerns.

-- Whiners tend to assume the worst. When any kind of change is rolled out in the workplace -- a new policy, a new project, a shift in assignments -- they jump to conclusions and broadcast their negative comments for all to hear. Facts often get ignored or distorted, and resistance to the change starts to build. The solution? Be ready with an ample supply of correct information. For example, if you feel that someone is slamming the new sick-leave policy by twisting the facts, call in a colleague who knows the policy inside out. Have this person brief staff members, or gather the necessary information yourself and circulate it throughout the workplace.

-- Involve your workplace whiner in developing the very things he whines about. It sounds counterintuitive, but it's a great way to turn his plentiful energy into positive action. If a new project is being contemplated, enlist his help in determining the scope, goals, and other elements of the project charter.