Introduction , definition of structure integrity, concept of fitness-for-service methods, fraction mechanics theory ( Diving force and fracture toughness, K, CTOD , J ) linear elastic fracture mechanics ( LEFM ) , Elastic fracture mechanics ( EPEM ), Flow types, Fracture mechanics testing, Fracture assessment using failure assessment diagram ( FAD ) approach, Fracture toughness R, curve fatigue crack growth, fatigue design of welded joints, fatigue assessment procedures in BS7910 non-destructive testing and practical exercises and case studies.