This book is a joint effort of like-minded researchers to define the concept of process within a psychological setting. Although minor differences exist as regards choice of background theory, their common focus is on personality in a broad psychodynamic context. Their definition of personality rests on a series of test instruments that have been validated during decades of thorough and vigorous empirical work. These were originally designed to open up micro-processes underlying the adaptation to or construction of reality, and have subsequently proven diagnostically efficient. Coming from both sides of the Atlantic, the contributors have their background in psychological as well as medical institutions. The contributions in the book are examples of a vital source sustaining our efforts to get a more profound understanding of the vicissitudes of the human mind.