PSYCHOLOGICAL EXAMINING IN THE UNITED STATES ARMY, 



PART II.— METHODS OF EXAMINING: HISTORY, DEVELOPMENT, 



AND PRELIMINARY RESULTS. 



INTRODUCTION TO PART II. 



This part of the 'official report of psychological examining in the Army does not follow 

 the first part chronologically, but, instead, merely logically and because of necessity of arrange- 

 ment. It is limited in the main to an account of the development of methods, a detailed 

 description of methods, and the presentation of the measures of their reliability. With respect 

 to the methodological aspect of the "service," Part II is historical, as is Part I. 



The methods herein presented were, in their original form, the work of a "subcommittee 

 on methods for the psychological examination of recruits" which was organized under the 

 American Psychological Association and the Committee for Psychology of the National 

 Research Council. 



In general, Part II follows the method of classification used in Part I, and consists of 

 four main divisions: (1) The methods formulated by the subcommittee, mentioned above, 

 at Vineland, N. J., between May 28 and July 7, 1917; (2) the unofficial trial of these methods 

 on about 4,000 recruits in the Army and Navy during July and August, 1917, under the 

 auspices of the National Committee for Mental Hygiene, and the revision of the methods in 

 the light of the results obtained; (3) the official trial of approved methods in four National 

 Army cantonments between September, 1917, and January, 1918; and (4) the revision, recon- 

 struction, and supplementation of these methods after psychological service had been extended 

 to the entire Army in January, 1918. For this part of the report Maj. Lewis M. Terman is 

 primarily responsible. He was materially assisted by Dr. Mabel R. Fernald, Miss Margaret 

 V. Cobb, and Mr. Carl R. Brown. Dr. Fernald and Maj. C. S. Yoakum assembled and pre- 

 pared for publication the data on examinations obtained in the revision of examination beta. 

 Mr. Brown prepared the data and manuscript on the relation of alpha and beta scores to 

 officer's estimates of intelligence, and on the relation of military efficiency to performance in 

 the various tests of examination alpha and beta. 



Robert M. Yerkes, 

 Lieut. Colonel, U. S. B. 



Washington, D. C, Hay 15, 1920. 



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