EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We consent to the incorporation by reference in Registration Statements Nos. 333-37304, 333-74940, 333-114979 and 333-123948 on Form S-8 of our report dated March 29, 2006, appearing in this annual report on Form 10-K of The Management Network Group, Inc. for the fiscal year ended December 31, 2005. /S/ DELOITTE & TOUCHE LLP KANSAS CITY, MISSOURI MARCH 29, 2006