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Each technique is usually applied on an individual basis and information from each NDT system is sometimes inconsistent or conflicting even between different instruments which are carrying out the same type of inspection. Therefore, the synergistic use of information from multiple instruments will provide a consensus assessment and help in decision making by providing a final output, with associated probabilities which may support or refute information from one or multiple sensors. The process used to combine information from multiple sources is called data fusion. The research work described in this thesis demonstrates that NDT data fusion can facilitate signal interpretation, defect quantification and provide a solution which may be implemented in the use of remotely operated multiple inspection techniques. Non-destructive testing data integration and fusion applied to the inspection of composite materials and to welds are described. 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