In the third week of Quanti•Qamp, Patrick and Greg ramble semi-coherently about how you might use existing data to drive a quantitative research idea as well as to serve as the foundation for making a unique quantitative contribution. They explore different potential data sources and discuss the variety of ways these might be used in the pursuit of a quantitative research question. They conclude with the next QQamp assignment: identify a small number of existing data sets in your substantive field that you might be able to make use of in your own quantitative research. Carry on.