3. They nag. Lecture. Repeat. Then yell
If one verbal nudge won't get a kid to come to dinner, 20 surely will. Right? In fact, there's abundant evidence that humans tune out repeated commands. "So many parents think they have to get very emotionally upset, yell, threaten, use sarcasm," says Lynn Clark, a professor emeritus of psychology at Western Kentucky University and author of SOS Help for Parents. "The child imitates that behavior, and you get sassy talk." Nagging also gives children "negative reinforcement," or an incentive—parental attention—to keep misbehaving. "I was kind of ignoring the good behavior, and every time he did something wrong, I would step in and give him attention," says Nancy Ailes, a 46-year-old stay-at-home mom in East Haven, Conn. She was frustrated with her 9-year-old son, Nick, who would melt down and throw things if the day's schedule changed, drag his feet about cleaning his room or doing homework, and call her "bad Mommy" if she complained.
Parent management training this spring at the Yale Child Conduct Center taught Ailes and her husband how to use positive reinforcement instead—to praise Nick immediately and enthusiastically. Now, when Nick is picking up his toys in the family room, she sits down, watches, and says: "Wow, that looks really nice!"
Ailes and her husband, David, also learned how to set up a reward system with points that Nick can cash in for Yu-Gi-Oh cards and Game Boy time and to back up the system with timeouts for bad behavior. Within three weeks, Ailes says, Nick had made a complete turnaround. "Instead of doing things that make people unhappy," she says, "you do things that make them happy!"
4. They praise too much—And badly
It seems like a truism that praising children would make them feel good about themselves and motivate them to do better. But parents don't give children attaboys as often as they think, Kazdin says. And when they do, it's all too often either generic ("good job!") or centered on the person, not the task ("you're so smart!"). This kind of praise actually makes children less motivated and self-confident. In one experiment by Carol Dweck, a psychologist now at Stanford University, fifth graders who were praised for being intelligent, rather than making a good effort, actually made less of an effort on tests and had a harder time dealing with failure. "It's so common now for parents to tell children that they're special," says Twenge. That fosters narcissism, she says, not self-esteem. Twenge thinks parents tell a child "You're special" when they really mean "You're special to me." Much better in every way, she says, to just say: "I love you."
5. They punish too harshly
Although spanking has been deplored by child-development experts since the days of Dr. Spock in the 1940s, as many as 90 percent of parents think it's ok to spank young children, according to research by Murray Straus, a professor of sociology at the University of New Hampshire. Kazdin and other behavioral researchers say parents commonly punish far more harshly than they need to. After all, it's not supposed to be about payback, though that's often what's going on, says Jamila Reid, codirector of the Parenting Clinic at the University of Washington. The clinic's "The Incredible Years" program has been found in seven studies to improve children's behavior. "Often parents come looking for bigger sticks. We tell parents the word discipline means 'teach.' It's something to teach a child that there's a better way to respond."
Consider the fine art of the timeout. Parents often sabotage timeouts by lecturing or by giving hugs, according to Sheila Eyberg, a professor of psychology at the University of Florida. Her Parent-Child Interaction Therapy is used in many mental health clinics. Forehand and other researchers have spent many hours observing the use of timeout as a disciplinary strategy to determine exactly what makes it effective. The key finding: Discipline works best when it's immediate, mild, and brief, because it's then associated with the transgression and doesn't breed more anger and resentment. A timeout should last for just a few minutes, usually one minute for each year of age of the child.