John's dad is a mechanic and not a developmentalist by nature. He's often annoyed with 16-year-old Christopher, his son, who has made little progress in deciding what career he wants to pursue, but he spends hours choosing which shirt and hat to wear to have pizza with his friends. A developmentalist might explain that adolescents:

focus on the superficial before the serious, for example, their careers
enjoy making their parents angry.
have too many choices; limit the clothing he has.
are irresponsible.