Describes a simulation method for measurement of errors that requires calculators and tables of random digits. Each student simulates the random behaviour of the component variables in the function and by combining the results of all students, the outline of the sampling distribution of the function can be obtained. (GA)

Describes advances in capture-recapture modeling, including the biologically motivated emphasis on model-based hypothesis testing and the development of models for spatially stratified populations. Discusses the severe problems associated with count statistics reflecting unknown sampling fractions. (67 references) (KR)

If any one fact has emerged consistently in the International Project for the Evaluation of Educational Achievement (IEA) studies of educational achievements, it is that achievement is related to a variety of factors in the home background of children. This is true so far as differences in the achievements of single students within a country are…