strength is that social influence processes based on psychological research do work
Nolan aimed to see if they could change people's energy-use habits.
Messages were hung on the front doors of houses every week for a month. It said most residents were trying to reduce their energy usage. Some residents had a message that just asked them to save energy as control.
There were decreases in energy usage
This shows that conformity (majority influence) can lead to social change through the operation of normative social influence, i.e. it is a valid explanation.