The CAS Subcommittee on Summer Graduate Schools (CAS-SSGS) is charged with proposing graduate summer schools to the Directorate and the Scientific Advisory Committee. Topics for proposed graduate schools should be of current widespread interest -- each school must attract at least 40 student participants to be financially viable -- and not too closely aligned with other planned or recently-held summer schools. Though some MSRI graduate summer school topics are predetermined by upcoming programs at MSRI or its partners, there is potential for CAS influence on 1-3 graduate summer school topics per year.