W.W. Grainger (GWW)

2006 Performance Share Program

On February 21, 2006, the Compensation Committee of the Board of Directors (the "Committee") of W.W. Grainger, Inc. (the "Company") adopted the 2006 Performance Share Program (the "Program"). The Committee established the Program to encourage decision-making leading to improvements in shareholder value, to align management with the Company’s growth objectives, and to attract and retain key executive talent. The Company’s elected officers (approximately 30 individuals) will participate in the Program (the "Participants"). Awards under the Program were granted February 21, 2006 in the form of "Performance Shares" pursuant to the terms of the Company's 2005 Incentive Plan. Performance Shares will be earned, if at all, following the 2008 fiscal year, and will be settled in shares of Company common stock.

Under the Program, a Participant is entitled to receive a number of Performance Shares determined by the Company’s performance against a growth target for total net sales, with the vesting of those Performance Shares being subject to the Company’s achievement of a return on invested capital (“ROIC”) target. More specifically, each Participant is awarded a target number of Performance Shares, but the actual number of Performance Shares which the Participant may receive can vary from the target number depending on the Company’s total net sales during its 2006 fiscal year as compared to those during its 2005 fiscal year.

The vesting of the Performance Shares will depend on the Company’s average ROIC during its 2006, 2007 and 2008 fiscal years. If the Company’s average ROIC during that period is less than the target, then none of a Participant’s Performance Shares will vest. If the average ROIC equals or exceeds the target, then 100 percent of a Participant’s Performance Shares will vest (in other words, either all of a Participant’s Performance Shares will vest, or none of them will vest). Under the February 21, 2006 awards, the aggregate target number of Performance Shares granted to Participants was 56,400.