How can I refine my problem definition?
Challenge Competitions can surface ideas or skillsets people have, and may lead to discovery of new network of collaborators and partners.
When the topic is a well understood, and of high public interest, Crowdsourcing Ideas can provide you the breadth of opinions and perspectives from a large number of people.
If your problem deals with unfamiliar communities or culture, Ethnography can help achieving in-depth understanding on the broader socio-cultural practices and characteristics.
If you already have qualitative and quantitative research data on the problem, use Behavioral Sciences principles to better understand the parameters of the problem space.