**President**

**Section 906 Certification under Sarbanes Oxley Act**

 

 

 

I, Michael G. Clark, certify that: 

 

| 1.
I have reviewed this report, filed on behalf of DWS S&P 500 Index Fund, a series of DWS Investment Trust, on Form N-CSR;
 

2.
Based on my knowledge and pursuant to 18 U.S.C. § 1350, the periodic report on Form N-CSR (the “Report”) fully complies with the requirements of § 13 (a) or §15 (d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
 

 

 

February 29, 2008

/s/Michael G. Clark

 

Michael G. Clark 

 

President

 

DWS S&P 500 Index Fund, a series of DWS Investment Trust

 

 

 

 

**Chief Financial Officer and Treasurer**

**Section 906 Certification under Sarbanes Oxley Act**

 

 

 

I, Paul Schubert, certify that: 

 

1.
I have reviewed this report, filed on behalf of DWS S&P 500 Index Fund, a series of DWS Investment Trust, on Form N-CSR;
 

2.
Based on my knowledge and pursuant to 18 U.S.C. § 1350, the periodic report on Form N-CSR (the “Report”) fully complies with the requirements of § 13 (a) or § 15 (d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.
 

 

February 29, 2008

/s/Paul Schubert

 

Paul Schubert 

 

Chief Financial Officer and Treasurer

 

DWS S&P 500 Index Fund, a series of DWS Investment Trust

 

 

  |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|