More on youth development and the 40 Developmental Assets needed by 12 to 18 year olds, as described by the Search Institute. 

3) Neighborhood Boundaries: where neighbors take responsibility for monitoring young people’s behavior.
Tell other parents when you see their children being responsible or generous in their actions. Try to find opportunities to praise more often than you report misbehavior.

Make your home a place where kids want to come. If kids get rowdy in your home, be calm but firm in re-establishing order.

Meet the parents of your children’s friends. If your preteen wants to go with friends to a movie or the mall without you, call other parents first to agree on pick-up times and movie choices.

More on youth development and the 40 Developmental Assets needed by 12 to 18 year olds, as described by the Search Institute. 

1) Family Boundaries: where family has clear rules and consequences, and parents monitor teens' whereabouts.
Always ask where your kids are going, with whom, and when they’ll be home.

The next time your child lashes out at you, try responding with love rather than anger, such as, “I’m sorry you’re feeling that way right now. I love you, but it’s not okay to act this way.”

Learn to be flexible when setting boundaries and to take the long view. Trends come and go and always will.

The "Find Youth Info" website talks about elements of positive youth development:

Positive youth development is an intentional, pro-social approach that engages youth within their communities, schools, organizations, peer groups, and families in a manner that is productive and constructive; it recognizes, utilizes, and enhances youths' strengths; and promotes positive outcomes for young people by providing opportunities, fostering positive relationships, and furnishing the support needed to build on their leadership strengths.

Positive youth development has its origins in the field of prevention. In the past, prevention efforts typically focused on single problems before they surfaced in youth, such as teen pregnancy, substance abuse and juvenile delinquency.