Part I. Theoretical Framework: 1. Abilities as forms of developing expertise Part II. The Nature of Dynamic Testing: 2. An introduction to dynamic testing 3. A capsule history of dynamic testing Part III. Leading Modern Approaches to Dynamic Testing: 4. The approach of Feuerstein 5. The approach of Budoff 6. Diverse approaches to dynamic testing 7. A three-prong approach to dynamic testing Part IV. Two Case Studies using Dynamic Testing: 8. Using dynamic testing to reveal hidden potential 9. Combining instruction with assessment: measuring foreign-language learning ability 10. Measurement aspects of dynamic testing: quantifying change Epilogue.