Final answer:
The actualizing tendency is the innate drive in all organisms to develop to their fullest potential, while the organismic valuing system is the process of evaluating experiences based on their contribution to this growth. Both concepts are integral to Carl Rogers's humanistic approach to personal development and psychotherapy.
Step-by-step explanation:
The client-centered concepts of the actualizing tendency and the organismic valuing system are central to Carl Rogers's humanistic approach to personality and psychotherapy. The actualizing tendency refers to the inherent drive present in all living organisms to develop their capacities to the fullest extent possible. This is the primary motivational force behind our behavior and growth, pushing us towards self-actualization, or becoming the best person we can be.
On the other hand, the organismic valuing system is a sub-process within this overarching actualizing tendency. It is the process by which we judge experiences in terms of their value for fostering or hindering our actualization and growth. This system helps us determine what is good or bad for us, thus influencing our choices and our paths to self-actualization.
These concepts are both crucial in understanding not only how individuals grow and develop their personalities but also the therapeutic approach that can facilitate this personal growth, emphasizing concepts such as free will and self-determination rather than deterministic biological factors.