ACM SIGMOD’s Digital Symposium Collection (DiSC) is a premier source of information on data and information management research. DiSC is produced in electronic form (i.e., DVD) and has a fully searchable content index. Each version of DiSC contains the proceedings including some multimedia content (e.g., keynotes and panel discussions) of relevant journals, conferences, symposiums, and workshops that took place during the previous year. DiSC started in 1999. Due to difficulties in obtaining permission for the material that appears in DiSC, the final DiSC is DiSC 2011.