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# Rule #Rule  8. Foster and use data repositories. Sometimes the hardest and most time-consuming step of sharing data and code is finding and deciding where to put them. Your community may already have a standard repository. At present, data-sharing practices vary widely across disciplines. In some fields, data sharing and reuse are essential and commonplace, while in others data sharing is a "gift exchange" culture \cite{Wallis_Rolando_Borgman_2013}. If you don't know where to start looking, ask an information specialist, such as a data scientist or a librarian working in your field (and consult the directories of data repositories listed in the Appendix). If more than one repository exists in your field, how do you pick the one that's best for you? Look for community uptake, accessibility, discoverability, value-added curation, preservation infrastructure, organizational persistence, ease of submission, and support for the data formats and standards you use. If your field has no domain-based repository, your institution may have one. Your local librarian or archivist can instruct you on how to host your data at your institution. If neither your community nor your institution have dedicated repositories, a variety of generic repository sites are available or how about installing and promoting a repository yourself? (See relative entries in the Appendix)