The development of the mathematics of dynamical systems now offers a rigourous framework to deal with complex phenomenon evolving with time. The possible euristic value of applying dynamical concepts to the field of psychopathology is investigated here. Three levels of applications found in the literature are reviewed: metaphoric, qualitative and quantitative. Psychopathology seems indeed a field where the concepts of dynamics can offer important tools, both theoretical and empirical. Nevetheless, specific problems should be emphasized to obtain a more profound insight in normal and pathological mental phenomenon.