A one-year-old attempting to build a tower of blocks may bring the pile crashing down, yet her five-year-old sister accomplishes this task with ease. Why do young children have difficulty with problems that present no real challenge to older children? How do problem-solving skills develop? In Children Solving Problems, Stephanie Thornton surveys recent research from a broad range of perspectives in order to explore this important question.

What Thornton finds may come as a surprise: successful problem-solving depends less on how smart we are--or, as the pioneering psychologist...