The purpose of the present volume is to make Adler's contributions to the theory and practice of psychology available in a systematic and at the same time authentic form. To this end we made selections from his writ- ings and organized them with the aim of approximating the general presentation of a college textbook. Because every word in the main body of the work is Adler's, the outcome of our efforts, if we have been successful, should be the equivalent of a textbook by Adler on Individual Psychology, the name which he gave to his system.