Early in the 20th century, the french public school system wanted an assessment that would identify those students who

In the early 20th century, the public school system in France wanted to develop a test or assessment that would help the schools identify which students had difficulty learning or were unable to benefit from regular day to day classroom instruction. Two psychologists were able to come up with an assessment test to accomplish this task. Their names were Alfred Binet and Theodore Simon.

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other.