creases in funding, so less attention is paid to supercomputing, and support for computational scientists with capability needs has been diluted.

It is important to repair the current situation at NSF, in which the computational science users of supercomputing centers appear to have too little involvement in programmatic and budgetary planning. All the research communities in need of supercomputing capability have a shared responsibility to provide direction for the supercomputing infrastructure they use and to ensure that resources are available for sustaining the supercomputing ecosystems. Funding for the acquisition and operation of the research supercomputing infrastructure should be clearly separated from funding for computer and computational science and engineering research. It should compete on an equal basis with other infrastructure needs of the science and engineering disciplines. That is not now the case.