Asked how often they change their optical merchandising displays, 33 percent of ROB readers said they change the displays once a month. Twenty-eight percent change these merchandising materials once every three months while 22 percent said they have no system for changing optical merchandising displays and don’t keep track of how often they happen to switch out these materials. Six percent change the displays every two weeks while another six percent change the displays every six months. Yet another six percent only change the displays once a year.