PSYCHOLOGY 363 



or professional school, whereas D individuals are rarely 

 able to pass beyond the third or fourth grade of an elementary 

 school, however long they may attend. 



The methods developed for the classification of personnel 

 under the Adjutant General of the Army and for the solution 

 of special problems are entirely too varied for description 

 here. In the first instance they are primarily adaptations of 

 business methods, many of which were improved and supple- 

 mented by the application of psychological knowledge and ex- 

 perience. 



In the case of special psychological problems it was usually 

 a matter of analyzing the military situation carefully and of 

 drawing upon the resources of psychological laboratories, or 

 more often of psychological skill, for the particular variety 

 of apparatus or technique which promised to solve the prob- 

 lem. Ingenuity was at a premium, but it could not be used 

 successfully until the military situation had been skilfully ana- 

 lyzed and its important factors or requirements brought into 

 clear light. Several psychologists were eminently successful 

 both in analysis and in devising or -adapting methods to cover 

 the results of analysis. 



