This paper addresses the conditions under which quantitative and qualitative research methods could be combined in special education. The paper asserts that qualitative designs have not had a significant effect on special education research and speculates that mixed-method research might be more acceptable to special education researchers or editors than studies 4sing only qualitative methods. The methodological characteristics of each approach to research are described. Strategies for mixing quantitative and qualitative research methods are discussed. The work of Robert Yin, who has described ways in which quantitative data can be embedded in case studies, is examined. The use of mixed-methods in educational evaluation is addressed, and the special case of single-subject research is analyzed. Several examples of the integration of qualitative and quantitative methods are then described. The paper concludes with a discussion of the need for and viability of mixed-method research in early intervention. This conclusion argues that mixed-method research is needed for both philosophical and pragmatic reasons, but that it is important not to let mixed-method designs excuse researchers from following the principles or rules of each method. Mixing methods generates the possibility of creating a higher standard of research which would take into account the complexity of the organism, the environment, and the intervention, as well as different perspectives on the purpose of research. (Contains approximately 65 references.) (JDD)