CERTIFICATIONS PURSUANT TO SECTION 906 OF THE
                          SARBANES-OXLEY ACT OF 2002

David G. Booth, Principal Executive Officer, and David R. Martin, Principal
Financial Officer, of Dimensional Investment Group Inc., a Maryland corporation
(the "Registrant"), each certify that:

       1. The Registrant's periodic report on Form N-CSR/A for the period ended
          October 31, 2011 (the "Report") fully complies with the requirements
          of Section 13(a) or Section 15(d) of the Securities Exchange Act of
          1934, as amended, as applicable; and

       2. The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Registrant.

By:  /s/ David G. Booth
     ---------------------------------
     David G. Booth
     Principal Executive Officer
     Dimensional Investment Group Inc.

Date: March 16, 2012

By:  /s/ David R. Martin
     ---------------------------------
     David R. Martin
     Principal Financial Officer
     Dimensional Investment Group Inc.

Date: March 16, 2012