Using data from 1,162 people entering treatment and followed up ( 94%) for 8 years, this article examines the relationship between the duration of abstinence (1 month to 5 or more years) and other aspects of recovery (e.g., health, mental health, coping responses, legal involvement, vocational...

Randomized field experiments are often logistical failures. They are particularly difficult to implement when the intervention involves a large number of components or service providers. Although surmountable, potential methodological problems with using randomized experiments to evaluate...

Increased use of randomized experiments to evaluate social programs throughout the world has been a major advance in evaluation research. This article focuses on determining which program evaluations are appropriate or feasible for randomized experiments. These threshold conditions include: (1)...