Methods, apparatus, and systems to collect audience measurement data are disclosed. A disclosed example method includes collecting first program identification data and audience identification data during a first time period, the audience identification data being collected by prompting audience members in the monitored household to self-identify using a people meter, developing audience member behavior data based on the first program identification data and the audience identification data collected in the first time period, collecting second program identification data in a second time period after the first time period without collecting audience identification data, and identifying the audience members associated with the second program identification data based on the audience member behavior data.