Managing difficult behavior is the No. 1 concern we hear about from parents. Setting limits for kids in a calm and consistent way and responding to problem behavior when it occurs are among the toughest parts of parenting. In this section we try to take the guesswork out of effective discipline with experts’ advice on issues like the best way to give effective instructions, why your time-outs might not be working, tantrum management strategies, and how to stop yelling and start being heard.