Paper is concerned with the hypothesis that two variables have a perfect disattenuated correlation, hence measure the same trait except for errors of measurement. (Author/RK)

A model with only ten or twenty decision variables can be more instructive than large scale cost simulation models. Research efforts should concentrate on understanding the order-of-magnitude effects of proposed policy changes on various indicators of system performance. (Author/VW)

Supports hypothesis that students are influenced by monetary returns to their educational investment. (Editor/AG)

Teacher adopts standards of measurement as an incentive toward understanding non-standard concepts and as a way of teaching children to work together. (RK)

With the aid of the programmed computer, the systems designer can analyze systems for which certain components have not yet been manufactured or even invented, and the power of solution-technique is greatly increased. (IR)

This paper proposes a general model for free-response data collected for measuring a specified unidimensional psychological process; systematizes situations which vary with respect to the scoring level of items; and finds out general conditions for the operating characteristic of an item response category to provide a unique maximum likelihood…

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)