We give an overview over the principles of constraint- based test data generation, discuss its limitations and potentials and touch some of the domains which may be interesting to combine with constraint-based testing techniques. Automated generation of test data is an example where this technique can be applied and significantly increase the degree of automation, but it is not limited to. This paper is intended to give interested readers a quick entry into the methods and applications to allow a deeper understanding and an informed verdict about the actual capabilities and potential future directions.