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\end{itemize}  In principle, if the above are specified, and the quantitative metrics meet user requirements, the data can be used with high level of confidence. A similar approach to defining data quality was recently proposed within the context Nanotechnology Knowledge Infrastructure Signature Initiative within the National Nanotechnology Initiative\cite{DRLs}.   An often posed question in the research community with regard to data associated with peer-reviewed journal articles is that of peer-review of the data itself. Indeed, it has been reported that approximately 50\% of data being reviewed for submission to the The American Mineralogist Crystal Structure Database contained errors.\cite{downs} The elements defined above represent the key criteria by which to judge the quality of the data. General pedigree and provenance information are typically conveyed in most research articles, though they may be provided in insufficient detail to reproduce the data. The remaining elements of validation, verification, uncertainty and sensitivity are often  relatively loosely defined within materials science and engineering and, and  best practices have not generally been developed for each element, or, where developed, are not in widespread use.