Authors Po Bronson and Ashley Merryman have made a habit of slaying the sacred cows of parenting in their writing on child development. The pair made headlines two years ago in "NurtureShock" -- their first book together -- in which they criticized the way many parents choose to raise their children.

Bronson and Merryman have just released their newest work, "Top Dog." In two interviews, they shared some thoughts on strategies parents should follow to best ensure their offspring are (broadly defined) winners, not losers.

Many parents may find validation in their advice, while others may argue their definition of success is far too narrow.

Q: You say parents have a common misconception about their role raising children. Can you explain that?

Bronson: Parenting is not just about safety and security. It's about expanding your child's comfort zone. For example, a child needs to know he or she is safe, but after that, it's OK for a parent to make their son or daughter feel unstable. Meaning, children have to get used to the frustration and jealousy that come from competition.

Q: What do you mean exactly?

Merryman: We have placed too much focus on the importance of comforting children.

There are still too many soccer teams that don't keep score and give trophies to every player. Kids aren't fooled when adults don't keep score. They know exactly who got what goal and who missed.

Q: Why is competition so important?

Merryman: Research says what makes an individual successful is the development of agency. Agency is that inherent belief in yourself -- the ability to have a vision and know you can go for it. The alternative is to look over your shoulder to get your friends' approval.