You do not currently have permission to view the full text for this document. Please sign in to an account with an active subscription or contact support.
The relation of qualitative change to quantitative change is important to psychoanalytic theory. Until recently no tools were available for dealing with the problem, but the development of catastrophe theory has provided methods for studying it. Psychoanalytic investigators might benefit from the methods of catastrophe theory, and dilemmas arising from the supposed impossibility of relating quantity to quality are seen to allow of solution.