“A highly scientific contribution, the purpose of which is to develop techniques for studying problems of behavior in quantitative terms and to ascertain the relation between behavior problems and such variables as age, grade, sex, achievement, and intelligence . . . An essential book for students of problem tendencies.”

“The methods used are carefully described so that they can be applied by any reader, and the results so far secured are candidly set forth and discussed.”

“This volume offers an encouraging note to persons who decry the lack of scientific approach in the study of behavioral problems.”