Synopsis A large portion of educational research involves the measurement of human abilities and traits, therefore, the problems of measurement are fundamental and the most fundamental are those having to do with the identification and specification of the abilities and traits whose measurement is desired. Some progress has been made toward determining what general intelligence tests measure and there is some information concerning the nature of achievement in the various subject matter fields. Another problem under this head involves the question of permanency of achievement. A second fundamental problem is the identification of causes. An important problem under this Suhrie is to determine the factors (instructional techniques, size of class etc.) that effect learning. The measurement of the contributions of given causes furnishes a fourth fundamental problem. The identification of the factors having a predictive value and the determination of the best basis for making desired predictions with the specified populations furnishes a fifth fundamental problem. The sixth fundamental problem is the determination of the objective of education. The above fundamental problems have been discussed in the book.