Donald Campbell's approach to causal inference (D. T. Campbell, 1957; W. R. Shadish, T. D. Cook, & D. T. Campbell, 2002) is widely used in psychology and education, whereas Donald Rubin's causal model (P. W. Holland, 1986; D. B. Rubin, 1974, 2005) is widely used in economics, statistics, medicine, and public health. Campbell's approach focuses on…

This literature review addresses the technical adequacy of time sampling observation systems, which is fundamental to ensuring the generalizability of data obtained from behavioral observation. Investigations comparing partial interval, whole interval, and momentary time sampling have yielded consistent results. These suggest that duration of…

Describes three themes that have informed research on cognitive development in sub-Sahara Africa over the past 10 years: (1) extending the range of generalizability of Western theories; (2) interpreting the uniqueness of the African situation; and (3) deriving implications for social policy. (Author/AS)

Forty-seven young children, 15 with disabilities, were observed 4 times for types and levels of engagement. Results indicated that engagement is difficult to measure through molecular data collection techniques because of error in dependability measures. The number of observed sessions could be increased to achieve generalizability, but increases…

In this book, which applies the state of the art in qualitative research to special education, qualitative research is used as a generic term for investigative methodologies described variously as ethnographic, naturalistic, anthropological, field research, or participant-observer research. Chapter 1 introduces and defines qualitative research and…