Are radio listening diaries accurate?

Radio diaries have been used as a tool to record listener behaviour since the 1930s, largely because they offer the advantage of allowing for the measurement of activity over a period of time rather than within an individual time spot.

Are radio listening diaries accurate?

Andrew GreenZenithOptimedia

BACKGROUND

The first use of a diary to record radio listening was in April 1934 when NBC in the United States included it in an 'activity' diary placed with 3,042 housewives nationwide.1Diaries...