her first long-term study of the gifted began in 1922 in new york. hollingworth used a group of fifty children, aged between seven and nine years old. all of them had iqs over 155. they were studied over the course of three years. this experiment had two goals. the first was to gain a better understanding of as many aspects of these children as possible. this included information on their backgrounds, family life and circumstances, their psychological states and makeup, and also their physical, temperamental and social traits. the second goal was to gain insights as to what the best curriculum for these children would be. the results of this study are published in her book "gifted children" (1926). she continued to stay in contact with the children long after the completion of the study. during the eighteen years that followed she added information about the spouses and offspring of the original participants to the study and results.