[Teaching experiment in the evaluation of the choice of methods in postgraduate education of radiologists].
A pedagogical experiment was used to study the effectiveness of a system of program-purpose teaching in postgraduate training of radiologists differing from the classic methods aimed at end goals. A total of 150 pedagogical tests on 240 students using parallel and cross methods were performed. The use of the system of program-purpose teaching intensifies the physician's activities, increases the effectiveness of acquiring professional habits and their retention.
The purpose of this study was to examine the developmental changes in preschool children's play behavior in public school preschool classrooms. From the original four hundred eighty economically disadvantaged children in public pre-kindergarten programs funded by Chapter 1, two hundred eighty three children were used for the final analyses of this study. Children's play behaviors during free play time were observed twice over the school year in their classroom settings using an event sampling method. A series of repeated measures multivariate analyses of variance (MANOVA) were conducted to test 12 hypotheses. In addition to examining the developmental aspects of play, the findings were also compared with those of previous research studies to determine how public preschool intervention programs contribute to children's play development.