Zone of proximal development (ZPD) is known to be the gap which exists between what an individual can perform alone without assistance from anyone and with assistance from an intelligent and well educated person which can be a teacher, parent, adult and so on. It is the zone in which a learner can learn and master new skills through assistance and guidance. Thus, for learning to be effective a little assistance is needed by a child in the zone of proximal development because the child will learn how to perform and do task on his own.
The Board of Governors of the Federal Reserve System, commonly known as the Federal Reserve Board, is the main governing body of the Federal Reserve System. It is charged with overseeing the Federal Reserve Banks and with helping implement the monetary policy of the United States. (Wikipedia)
The Thirteenth Amendment (Amendment XIII) to the United States Constitution abolished slavery and involuntary servitude, except as punishment for a crime.