The methodology of the most recent SONA study that I have been a participant for.
The most recent SONA study that I have taken part in was researching how much alcohol students consume and the reasons behind the drinking.
To research how much alcohol I had consumed they asked to to report how much alcohol I had consumed in the last four weeks (self-report method). For this I had to write down how much alcohol was consumed on which days and if it was a special occassion or not. This is not a very reliable way of collecting this information as I did not know I would have to do this so it was difficult to remember when I drank and exactly how much, and I expect this would have been a more unreliable measure for someone who drinks more frequently than I do.
To research the reasons for drinking and my mood when I was drinking I was asked to complete (many) closed question questionnaires. These were often repetitive and, in my opinion missed some reasons that people have for drinking. It concentrated more on the social pressures that may cause people to feel pressured into drinking. This series of questionnaires ended with a likert scale measuring how much I thought alcohol helped or hindered certain areas of life such as university work and future job prospects.
Overall this study is one of the simpler SONA experiments I have taken part in and found it a much easier one to concentrate on despite the repetitiveness (which leads to boredom), however I feel if they asked participants to keep track of drinking habits for a certain amount of time then their data may be more reliable than the participants trying to remember what they have had.