Chapter 1. Physical models in TNDT.- Chapter 2. Heat transfer in solid bodies.- Chapter 3. Determining thermal properties of materials.- Chapter 4. Heat conduction in structures containing defects and the optimization of TNDT procedures.- Chapter 5. Defect characterization.- Chapter 6. Data processing in TNDT.- Chapter 7. Theory of thermal radiation.- Chapter 8. Equipment for active TNDT.- Chapter 9. Infrared systems.- Chapter 10. Statistical data treatment and decision making in TNDT.- Chapters 11. Applications of thermal/infrared NDT.- Chapter 12. Certification and normative documents in TNDT.