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\subsection{Data Repositories}  Aside from crystallographic data repositories, there are at this time perhaps no dedicated materials data repositories that meet the required characteristics defined above. The materials science and engineering community does have numerous publically-accessible data repositories; however, the majority of these are associated with specific projects or research groups, and their persistence is therefore dependent on individual funding decisions. These repositories are primarily established to house and share the research data generated within a specific project or program. They generally don’t follow uniform standards for data and metadata, nor provision for data discoverability and citation. There are very few repositories established with the explicit objective of providing MSE with public repositories for accessible digital data. In short, publically accessible, built-for-purpose repositories and the associated infrastructure for access, safe storage and management still need to be developed and sustainably funded—this is the largest impediment to implementing viable data archiving policies. (See, for example, ``Sustaining Domain Repositories for Digital Data: A White Paper''\cite{http://datacommunity.icpsr.umich.edu/sites/default/files/WhitePaper\_ICPSR\_SDRDD\_121113.pdf}.) Paper''.\cite{http://datacommunity.icpsr.umich.edu/sites/default/files/WhitePaper\_ICPSR\_SDRDD\_121113.pdf})  Evolutionary biology, for example, allows a mix of repositories that meet established criteria. Such criteria may be as simple as requiring data cited to be permanently archived in data repositories that meet the following conditions:  \begin{enumerate}