Jerome Kagen, who developed instruments to measure and classify the aspect of man's psychological make-up known as conceptual tempo, generated 3 conceptual tempos: reflective, impulsive, and neutral. These tempos are determined by measuring latency time (time lapse) from stimulus to first response and recording the number of errors made. In this 1968 study, 6 null hypotheses were tested using 18 migrant children aged from 4.5 to 14.2 years. Purpose of the study was to determine what effect, if any, the A Blocks treatment (a sub-unit of the Attribute Games and Problems unit) has on conceptual tempo. Of more specific interest was the effect of treatment upon enhancing reflectivity through modification of an impulsive tempo in migrant children. Control and treatment groups were set up wherein the examiner-teacher was permitted to guide the treatment group through a part of the A Blocks test; however, control group students had no directed activity but were allowed to converse with the examiner during the activity. It appears that if one's goal is to increase latency time between stimulus and initial response, the method used with the control group generates the most positive trend. The general conclusion was that the A Blocks portion of the Attribute Games and Problems unit does not enhance reflectivity of migrant children as measured by latency time and number of errors. (EL)