The Tower of Hanoi is a classic puzzle. Yet a cognitive analysis revealed decision requirements that had previously been unknown—showing the power of the cognitive dimension.

The Tower of Hanoi problem consists of moving a tower of 64 disks, each smaller than the one below it, originally existing on one peg, to a second peg, using a third peg for intermediate moves.

The Tower of Hanoi consists of a small board on which three identical cylindrical rods are mounted. On the left rod there are five disks of different sizes with a hole in the middle.