All the children were tested in three individual subtests of the Wechsler Intelligence Scale for Children–third edition (WISC III) which revealed their abilities in certain areas of mathematical thought.
Börnin tóku öll stöðupróf í ákveðnum þáttum stærðfræðilegrar hugsunar, nánar tiltekið í þremur einstaklingsprófum úr Wechsler Intelligence Scale for Children, 3. útgáfu (WISC III).