In this paper I explore how Margaret Beier, Lesley Miller, and Shu Wang make claims for the validity and reliability of the instrument they developed to explore the construct of "possible selves" as described in their manuscript, "Science Games and the Development of Scientific Possible Selves."

Explains that Rogers' proposed sequence of development in proportional reasoning is not really a modification of Inhelder and Piaget's task, but could be considered as a new task. Rogers acknowledged the explanation as a valid one. (GA)

Discusses reasons for questioning the underlying assumptions of instruments designed to measure knowledge of the nature of science. Recommends that researchers recognize that conflicting models of science exist, and that each instrument related to these models must specify all philosophic assumptions. (MLH)

Describes the design of a sequential switcher to be used for multichannel strip-chart recordings of temperatures at different points in a solar heated building. (GA)

Discusses instrumentation and describes such research areas as the albedos of the brighter planets, rotation rates and atmospheres of the larger and brighter satellites, brightness changes of outer planets, asteroid rotation rates, and variable stars. (GS)

Identifies a trend in analytical chemistry toward greater use of instruments and a need for an understanding of the basic principles involved in instrumentation. This need can be fulfilled using homebuilt equipment; examples are provided in the areas of electrolytic conductance and electronic coulometry. (GS)

Presented are lists of deshielding constants chosen to be easy to remember and to given estimates close enough to measured shifts to allow interpretation of the spectrum of a compound of known structure. (BT)

Describes modules designed to enable a student to learn a measurement technique and familiarize himself with measurement instrumentation independently of a laboratory course. Presents an example of a module involving the measurement of electrical resistance and lists other modules that have been developed. (GS)

Spectroscopic studies on solutions and x-ray diffraction work on crystals lead to the conclusion that the Metrogen of the pyrimidine ring is preferentially protonated. The correct monoprotonated structures of thiamine and its 4-amino-pyrimidine synthetic precursor are presented. (BT)

Discusses the development, field testing, and validation of an instrument designed to assess secondary school students' understanding of the nature of scientific knowledge. (GA)