1) Immediate responses and feedback can be helpful and revealing. Traditional surveys can capture some elements of behavior by asking people about what activities they have done in the past. For many years, Pew Research has regularly asked phone survey respondents what they did “yesterday” (for example, “Did you use your smartphone yesterday?” or “Did you read a newspaper yesterday?”). Pew Research has also asked respondents how often they engage in certain behaviors, using a scale from “frequently” to “never.” Those results are illuminating in providing us with insights into media consumption and technology use. But in our mobile experiment, we could make those insights more specific, asking people what they had done in the past hour. - www.pewresearch.org