SCHEDULE 14A INFORMATION

                  Proxy Statement Pursuant to Section 14(a) of
              the Securities Exchange Act of 1934 (Amendment No. )

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                                  14A-6(E)(2))
                         / / Definitive Proxy Statement
                       / / Definitive Additional Materials
                 /X/ Soliciting Material Pursuant to Rule 14a-12

                           ART TECHNOLOGY GROUP, INC.


                (Name of Registrant as Specified In Its Charter)

Mitchell Wright Technology Group, LLC, SSH Partners I, LP, Mitchell-Wright, LLC,
Arcadia Partners, L.P., Arcadia Capital Management, LLC, James Dennedy and
Richard Rofe

    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Attached as Exhibit 1 is a press release issued by Mitchell-Wright Technology
Group, LLC on October 5, 2004.






Exhibit 1

FOR IMMEDIATE RELEASE                                CONTACT:
October 5, 2004                                      Ellen Gonda
                                                     Brunswick Group
(212) 333-3810


MITCHELL-WRIGHT TECHNOLOGY GROUP CALLS ON ART TECHNOLOGY GROUP TO DISCLOSE
QUARTERLY FINANCIAL INFORMATION PRIOR TO MERGER VOTE


Cincinnati, OH, October 5, 2004 - Mitchell-Wright Technology Group, LLC ("MWTG")
today called upon Art Technology Group, Inc. [NASDAQ: ARTG] to immediately
release preliminary financial results for the quarter ending September 30, 2004
so that shareholders will have sufficient time to consider those results before
voting on the Primus Knowledge Solutions merger at the October 22, 2004 Special
Meeting.

James Dennedy, Managing Partner of MWTG, commented, "The vote on the merger of
ARTG and Primus Knowledge Solutions, Inc. [NASDAQ: PKSI] on October 22, 2004 is
very important to the future of ARTG. We are calling for the company to release
its preliminary net cash and revenue results for the third quarter. The
Company's Board and its CEO, Robert Burke, should not require shareholders to
vote without a true sense of the Company's current financial situation.

Mr. Dennedy pointed out that ARTG released preliminary results for the quarter
ended June 30, 2004 on July 1, 2004, one day after the end of the quarter. "We
know they have the ability to produce and release these numbers well before the
Special Meeting. We think it is imperative that the Company provide shareholders
with this critical information prior to the vote on the merger agreement.

"In the earnings call following the release of the second quarter results, ARTG
stated that it expected a greater than 10% revenue increase from the second
quarter to the third quarter, without the benefit of the pending $2 million
government contract. The total revenue for the second quarter was $14.3 million,
which would indicate total revenue for the third quarter of at least $15.7
million. In addition, the Company indicated that it would end the third quarter
with net cash in the range of $28 - $30 million. It is imperative that
shareholders have this information prior to voting on a merger that, we believe,
could further erode shareholder value."

                                      # # #

MITCHELL-WRIGHT TECHNOLOGY GROUP, LLC, MITCHELL-WRIGHT, LLC, SSH PARTNERS I, LP,
ARCADIA PARTNERS, L.P., ARCADIA CAPITAL MANAGEMENT, LLC, JAMES DENNEDY AND
RICHARD ROFE ARE PARTICIPANTS IN A SOLICITATION OF PROXIES FROM THE SHAREHOLDERS
OF ART TECHNOLOGY GROUP, INC. FOR USE FOR USE AT ITS SPECIAL MEETING SCHEDULED
TO BE HELD ON OCTOBER 22, 2004. INFORMATION RELATING TO THESE PARTICIPANTS AND
CERTAIN OTHER PERSONS WHO MAY ALSO BE DEEMED TO BE PARTICIPANTS IN THE
SOLICITATION OF PROXIES IS CONTAINED IN THEIR PRELIMINARY PROXY STATEMENT FILED
WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 28, 2004. A COPY OF
THAT PRELIMINARY PROXY STATEMENT IS CURRENTLY AVAILABLE AT NO CHARGE ON THE
SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT HTTP://WWW.SEC.GOV.

SHAREHOLDERS OF ART TECHNOLOGY GROUP, INC. ARE ADVISED TO READ THE PROXY
STATEMENT AND THE OTHER DOCUMENTS RELATED TO THE SOLICITATION OF PROXIES BY
MITCHELL-WRIGHT TECHNOLOGY GROUP, LLC AND THE OTHER PARTICIPANTS WHEN THEY
BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. WHEN
COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY WILL BE MAILED TO
SHAREHOLDERS AND WILL BE AVAILABLE AT NO CHARGE AT THE SECURITIES AND EXCHANGE
COMMISSION'S WEBSITE. IN ADDITION, YOU MAY ALSO OBTAIN A FREE COPY OF THE
DEFINITIVE PROXY STATEMENT WHEN IT IS AVAILABLE BY CONTACTING INNISFREE M&A
Incorporated toll free at (888) 750-5834 (banks and brokers call collect at
(212) 750-5833).

                                  END OF FILING