Multiple methods are vital to understanding development as a dynamic, transactional process. This article focuses on the ways in which quantitative and qualitative methodologies can be combined to enrich developmental science and the study of human development, focusing on the practical questions of "when" and "how." Research situations that may…

This statement of the National Institute of Mental Health Editors' Consortium discourages piecemeal publication of small amounts of data from the same study, requires study authors to inform editors about other manuscripts from the same study, and requires authors to submit copies of closely related manuscripts. (JDD)

Many educational questions of research interest focus on individual differences in attitudes and behaviors related to academic achievement, changes in such attitudes and behaviors over time, and the types of academic environments that facilitate or prevent development of achievement attitudes and behaviors at school. This paper, the first in a…