EX-15

Exhibit (15)

The Board of Directors and Shareholders of
The McGraw-Hill Companies, Inc.

We are aware of the incorporation by reference in the following Registration Statements:

(1)

Registration Statement (Form S-3 No. 33-33667) pertaining to the Debt Securities of The McGraw-Hill Companies, Inc.,

(2)

Registration Statement (Form S-8 No. 33-22344) pertaining to the 1987 Key Employee Stock Incentive Plan,

(3)

Registration Statements (Form S-8 No. 33-49743, No. 33-30043 and No. 33-40502) pertaining to the 1993 Employee Stock Incentive Plan,

(4)

Registration Statements (Form S-8 No. 33-92224 and No. 33-116993) pertaining to the 2002 Stock Incentive Plan,

(5)

Registration Statement (Form S-8 No. 33-06871) pertaining to the Director Deferred Stock Ownership Plan,

(6)

Registration Statement (Form S-8 No. 33-50856) pertaining to The Savings Incentive Plan of McGraw-Hill, Inc. and its Subsidiaries, The Employee Retirement Account Plan of McGraw-Hill, Inc. and its Subsidiaries, The Standard & Poor’s Savings Incentive Plan for Represented Employees, The Standard & Poor’s Employee Retirement Account Plan for Represented Employees, The Employees’ Investment Plan of McGraw-Hill Broadcasting Company, Inc. and its Subsidiaries, and

(7)

Registration Statement (Form S-8 No. 33-126465) pertaining to The Savings Incentive Plan of The McGraw-Hill Companies, Inc. and its Subsidiaries, The Employee Retirement Account Plan of The McGraw-Hill Companies, Inc. and its Subsidiaries, The Standard & Poor’s Savings Incentive Plan for Represented Employees, and The Standard & Poor’s Employee Retirement Account Plan for Represented Employees;

of our report dated April 25, 2007 relating to the unaudited consolidated interim financial statements of The McGraw-Hill Companies, Inc. which are included in its Form 10-Q for the quarter ended March 31, 2007.

/s/ ERNST & YOUNG LLP

New York, New York
April 25, 2007