Agencies also differ in their reporting.
These data are presented in Web-based funding updates throughout the summer and fall. When these other data sources are used, they are noted in tables and charts. The National Science Foundation's Division of Science Resources Studies and the OECD are among the most common sources for supplementary information. The user should be aware that although NSF and OECD use the same Definitions as OMB and AAAS in compiling their data, there may be discrepancies between different data sources. Congressional figures reflect AAAS estimates of basic research based on extrapolation of historical trends in basic research and Congressional appropriations.