<span>So when tom told his son he will a given a reward of $1 for every bag of leaves raked, the efficiency of the work increased from 1 bag in 2 hours to 6 bags in 2 hours. So here the idea of treatment data is utilized in the first 2 hour period as tom was observing how his son will fare without any reward. This is technique from behavioral strategy.</span>
You have to find your local SSA
The correct answer of the given question above would be VALIDITY. The concept that refers to deciding exactly what is to be measured when assigning value to a variable is validity. I hope this is the answer you are looking for. Let me know when you need more help next time.
