Original 1921 Haggerty Intelligence Examination: Manual of Directions for Delta 1 and Delta 2, by M. E. Haggerty of the University of Minnesota, published by World Book Company, Yonkers-on-Hudson, New York.

An uncommon early manual relating to the development and administration of standardized intelligence examinations in American education. The text discusses achievement and intelligence testing and provides detailed directions for administering and scoring the Haggerty Delta examinations.

The manual is especially interesting as a surviving primary-source document from the early development of educational psychology, psychometrics, standardized testing and intelligence measurement in the United States. The introduction also discusses the influence of group intelligence examinations developed in connection with World War I-era Army testing.

Date: 1921
Author: M. E. Haggerty
Publisher: World Book Company
Title: Haggerty Intelligence Examination – Manual of Directions for Delta 1 and Delta 2
Size: Approximately 7 1/2 x 5 inches

A fascinating original 1921 educational psychology document, well suited to collectors and researchers interested in the history of psychology, IQ and intelligence testing, American education, psychometrics, standardized examinations, or early 20th-century social science.