This review is part of a large research endeavor to develop a mathematical model to predict spelling difficulty. It reviews attempts to answer the question: What makes a word difficult to spell? (Author)

Fifth article in a sequence that originated with a controversial article by Arthur R. Jensen (1969) criticized by Richard J. Light and Paul V. Smith (1969) and countercriticized by the author (1971). (SE)

A new model for inheritance in intergenerational mobility is developed and related to mover-stayer models of intragenerational mobility. Application is made to data for the United STates, Britain, and Denmark. Predictions are required to match observed proportions of men remaining in their origin strata and also the observed distribution of men…

This paper discusses problems associated with the application of experimental methods to program evaluation, proposes an alternative approach (program-attribute scaling), and reports the procedure and results of a trial application of the alternative approach. (Author)

A statistical methodology applied to three years of teaching load data from 21 major public universities yields an objective, broadly applicable set of student credit hours (SCH) weight factors. A table of optimum weighting factors for upper division and graduate SCH is presented. (Author/MLW)

A mathematical model of information acquisition is presented and empirically evaluated in comparison to evidence obtained from experimental studies of science content acquisition. Implications of the model for human information acquisition and future research are discussed in the context of the unique theoretical framework of the model. (Author/JN)

Explains the three main concepts of the system dynamics approach to model building (dynamics, feedback, and systems) and the basic steps to problem solving by simulation applicable to all educational levels. Some DYNAMO commands are briefly described. (EAO)

To correct for sample selection bias problems, the authors present a mathematical model of decision-making and apply it to young women's decisions regarding college attendance or labor force participation. They find that the two decisions are strongly correlated and together affect the estimated rate of return on college education. (Author/RW)

Some single species and two species interactions in population models are presented to show how credible examples can be used to teach an underlying, common mathematical structure within apparently different concepts. The models examined consist of differential equations, and focus on real-world issues. (MP)