Final answer:
Self-control is thought to be instilled in individuals during early childhood and remains relatively stable throughout their lives. It predicts success in high school and adulthood.
Step-by-step explanation:
Self-control is thought to be instilled in individuals during early childhood and remains relatively stable throughout their lives. A study conducted by Mischel and his colleagues found that self-control in preschool-aged children predicted their success in high school and even in adulthood. The children who showed more self-control by waiting for a larger reward in the marshmallow test had higher SAT scores, positive peer relationships, and were less likely to have substance abuse issues. On the other hand, those with poor self-control in preschool had academic and behavioral problems in high school.