When attempting to determine if an intervention has a causal impact, the "gold standard" of program evaluation is the randomized controlled trial (RCT). In education studies random assignment is rarely feasible at the student level, making RCTs harder to conduct. School-level assignment is more common but this often requires considerable resources…

Studies of group differences in intelligence often invite conclusions about groups in general from studies of group differences in selected populations. The same design is used in the study of group differences in other traits as well. Investigators observe samples from two groups (e.g. men and women) in some accessible population, but seek to…

Research regarding the optimal fielding of online surveys is in its infancy and just beginning to offer clear suggestions for effective recruiting of participants as well as techniques for maximizing the response rate. In this article, the authors discuss the process of recruiting participants by e-mailing invitations to a list of recipients…

Significant numbers of students who are deaf and hard of hearing are educated in regular education settings, often outside the structure of established programs. Locating participants for research on deaf education has therefore become increasingly difficult. This article describes two approaches used to recruit participants in the recent online…

Innovative methods devised to obtain the desired number of Anglo, Mexican American and American Indian women for a study of the health of recently widowed low income women are explored. Social and health service agencies proved generally unable to assist by contacting their clients. Different techniques were found to be successful for recruiting…