Source : Free On-Line Dictionary of Computing

IDS/I
     
        Integrated Data Store.  AN extension to {COBOL} involving
        "chains" (circular lists), for {General Electric} computers.
     
        ["A General Purpose Programming System for Random Access
        Memories", C.W. Bachman et al, Proc FJCC 26(1), AFIPS (Fall
        1964)].
     
        [Sammet 1969, p. 376].