This paper presents a model which illustrates the cyclical and interactive nature of the basic elements of the research design process. Rather than presenting each research design component in isolation, the model emphasizes their interrelationships. A brief discussion is presented on each of the following components of the model: (1) the "words"…

Explores problems involved in the quantitative verification of independent variables in investigations of the effects on student outcomes of planned variations in instructional behavior. Specifically addresses (1) gathering of data through direct systematic observation, and (2) analysis of those data through the use of inferential statistics. (GC)

This paper reports 20 unsolved problems in educational measurement and points toward what seem to be promising avenues of solution. The first group of concerns involves validity, posing the problems of obtaining suitable validity criteria, determining and measuring the predictor variables that best characterize the traits and proficiencies of…

The difficulties in evaluating bilingual education appear to have prevented success in all but a few evaluation attempts, but better and more meaningful evaluation is neccessary in order to identify the strengths and weaknesses of bilingual programs. Many bilingual programs are undergoing constant modification, adequate assessment instruments have…

Structural equation models incorporating unmeasured variables make possible the rigorous testing of theories previously difficult to test adequately because of fallible measures of the theoretic variables. This paper first discusses a simple causal model; incorporating a single unmeasured variable for the purpose of exposition. A substantive…

The methodological parameters of evaluative research studies help to identify a conceptualization of the phenomenon under investigation. Holistic critiques that identify the conceptual models under which the research was conducted shed light on the validity of the disparate inferences made from a number of studies of schools and school…

The original version of this report dealt with the feasibility of a longitudinal design for studying the effects of preceptorships on medical students' career choices. The present document supplements the original report, focuses on various non-longitudinal designs, and assesses their suitability for providing the type of information required for…