Prevalence figures compiled before the 1950s were primarily limited to the intellectually gifted : those identified primarily through intelligence tests. At that time, 2 to 3 percent of the general population was considered gifted. During the 1950s, when professionals in the field advocated an expanded view of giftedness, the prevalence figures suggested for program planning were substantially affected. Terms such as academically-talented were used to refer to the upper 15 to 20 percent of the general school population