VAN KAMPEN AMERICAN CAPITAL INSURED INCOME TRUST SER 56, 485BPOS, EX-99.1.1, 2000-07-25

VAN KAMPEN AMERICAN CAPITAL INSURED INCOME TRUST SER 56
485BPOS, EX-99.1.1, 2000-07-25

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               Consent of Independent Certified Public Accountants

     We have issued our report dated May 19, 2000 accompanying the financial
statements of Van Kampen American Capital Insured Income Trust, Series 56 as of
March 31, 2000, and for the period then ended, contained in this Post-Effective
Amendment No. 6 to Form S-6.

     We consent to the use of the aforementioned report in the Post-Effective
Amendment and to the use of our name as it appears under the caption "Auditors".

                                                              Grant Thornton LLP

Chicago, Illinois
July 25, 2000