The yearly Supplement to the Presidents Budget for the NITRD Program is designed to present a succinct technical summary of the research activities planned and coordinated through NITRD in a given Federal budget cycle, as required by law. The Supplement is organized by PCA, to align with the structure of the Program. Every PCA section follows the same format, so that readers can quickly identify: The NITRD member agencies and participating agencies active in the PCA; The definition of the research covered in the PCA;The interagency strategic priorities in the PCA for the forthcoming fiscal year; Budget highlights ? agencies key RD programs and topical emphases in the PCA for the forthcoming year; Interagency coordination ? current and planned activities in which multiple agencies are collaborating; Ongoing core activities of each agency in the PCA; The NITRD Supplement also includes an annual budget table and budget analysis section, organized by PCA and by agency, to facilitate budgetary and programmatic comparisons from year to year.The Supplement itself is a product of NITRD coordination: The text is developed, revised, reviewed, and approved by the NITRD agencies in a collaborative process over a six-month period prior to the release of the Presidents budget. The process begins with an Annual Planning Meeting APM in each NITRD PCA. In these day-long gatherings, agency representatives present briefings summarizing their agencies IT research priorities, program plans, and current activities in the PCA. Following the briefings, the agencies discuss shared research issues and plan cooperative activities. The Supplements PCA sections are based on the APM discussions and subsequent refining of the text by the agencies. For example, the IWG and CG members review and update their PCAs definition statement and interagency R and D priorities to reflect evolution of key technologies and associated research challenges that agencies face in common. The agencies report on their collaborative efforts to address such challenges in the PCA subsection called Planning and Coordination Supporting Request.NITRD agencies engaged in R and D and coordination activities cited in the Supplement are listed in NITRD budget order, followed by the participating agencies. If there is a lead agency for the activity, that agency is listed first; agencies listed after the word with are in-kind contributors rather than funders or performers. Some large-scale activities may be cited in more than one PCA because they involve R and D efforts in a variety of technologies. In such cases, agencies report the portion of program funding in each relevant PCA.The President`s 2012 budget request for the NITRD Program is $3.866 billion; 2010 NITRD actual expenditures totaled $3.793 billion. Details of the budget are presented in the table on page 28 and discussed in the budget analysis section beginning on page 30.