The document provides guidance on developing a data management plan (DMP) to meet requirements for National Science Foundation grant proposals. It discusses the context and rationale for federal data policies, defines the key elements required for a DMP, and provides examples of DMPs for different types of research data. The main points are: understanding the NSF data policy aims to increase research impact and data sharing/reuse; a DMP must address the types of data generated, metadata standards, data access/sharing plans, long-term preservation, and associated costs; and good planning helps ensure data remains accessible, usable and preserved into the future. Resources and guidance are available to help researchers develop robust and fundable DMPs.