Any comments on specific survey questions that may have caused difficulty?
Pupils at our primary school found the questionnaire very easy to understand and most of them completed the questions in less than 45min.
Would you believe a man with a beard or a suit?
Would you believe a man with a beard or a suit?
...asks the BBC.
https://www.bbc.co.uk/news/magazine-15673359
Or both?
https://www.bbc.co.uk/news/health-15511823
https://www.bbc.co.uk/news/uk-15510306
Of course, on Radio, no-one can see your chin (LISTEN). Someone I met from a technical Support Desk did say I was taller in real life than I sounded on the phone...
One comment on the research: when doing my PhD over 20 years ago, I had a quick whizz through the existing research into effective communications, a subject which as McGuire notes has a long history, "or rather ... a long past". And one thing I did find out was that a message you reject when you are first presented with it, you might accept after a while.
McGuire, WJ (1968). 'Personality and susceptibility to social influence.' In Borgotta, EF & Lambert, WW (eds.) Handbook of personality theory and research. Chicago: Rand McNally.