National Science Foundation (NSF) grant proposals submitted after January 18, 2011 are required to include a "data management plan" as a supplemental document. This document must state how the proposed study will conform to the NSF's requirements for data sharing and desemination. These requirements are as follows: "Investigators are expected to share with other researchers, at no more than incremental cost and within a reasonable time, the primary data, samples, physical collections and other supporting materials created or gathered in the course of work under NSF grants. Grantees are expected to encourage and facilitate such sharing."
Data management plans should include the following information:
The details of the requirements differ by the NSF directorate to which the proposal is being submitted. Each directorate has provided a guidence document which can be found on the NSF website here: http://www.nsf.gov/bfa/dias/policy/dmp.jsp.