Recruitment is generally the first contact between researchers and prospective participants (whether through paper-based or online announcements, media communications, or face-to-face interactions) ...

Pew Research Center is committed to meeting the highest methodological standards — and to exploring the newest frontiers of research. Learn more about the methods the Center uses to conduct objective, ...

Proper quality measures are vital in all areas of clinical laboratory testing to prevent or avoid carryover between samples, as well as to minimize the risk of false-positive results. The sample ...