Start withIn psychology, metrics about psychological states like happiness are seldom assessed as a mirror andsingle question. The reason is that people's response to a simple question like "Are you happy?" is greatly influenced by many factors that might be unrelated to the particular goals of the person asking the question. So a survey might ask howa variety of questions and then "happiness" is a composite of the answers from eight of the twenty questions.
How do you define happiness and how is current department behavior is lacking.unhappy? How will you measure success, or report success to administration?
You can also look at the task as an attempt to correct problems or as an opportunity to augment things that are already good. So why would anyone ever work in your department? Do most of your faculty say they when they were looking for employment they had ten offers and they chose your department, or was this their only real choice?