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A challenge has been presented to the scientific community to apply "first principles" to the understanding, prediction, and control of nondestructive evaluation (NDE) processes and applications. The success of the program is evident in the attention of new researchers and in the diversity of scientific specializations that have been directed to NDE problems. Critique of the program has been in awareness of existing technology and in focus of resources. An approach based on "lessons learned" is suggested for meeting continuing challenges and projected challenges of the future. "Lessons learned" from NDE reliability assessment programs are reviewed. Quantitative NDE performance as a function of signal-tonoise ratio is discussed. Focus of future efforts on signal-tonoise improvements in production and maintenance environments is proposed.

Materials Testing 56 (2014) 7-8 the participants from the topics C, D and E joined forces and discussed the topics as one group. The groups separated and, under the lead of an expert, i. e., the group leader, the different issues were discussed. At the end of the day the groups were asked to present the content and the results of their work. Every group leader wrote a summary of the discussion. The purpose of this publication is to present the summaries of the held discussions and, therewith, share the main conclusions with the NDT community.

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