What building type has been studied?
What was the orientation of the building? (As this can help in deciding the factors including environmental/climatic and others may influence users to decide on switching their lights/heating/AC systems ON/OFF)
Which behaviour the users changed? Was it HVAC/Lighting/Vertical Mobility or Auxiliary Equipment?
NOTE: The instructions may seem detailed and exhaustive, but in my opinion they will make your way easy to approach the problem