In this article, I present data from two waves of research on demographic characteristics and practice patterns of marriage and family therapists (MFTs) conducted in 2000 and 2002. The research focuses on the methodological and technological issues in studying this population. Specifically, an online survey with MFTs obtained lower response rates and was therefore more expensive relative to phone and mail methods. Questions about evidence-based therapies (EBTs) were asked two different ways with significantly different results based on how the questions were phrased. A discussion of the relative advantages and disadvantages of using different survey methodologies and consideration of issues pertinent to studying EBTs are included.