Exhibit 99.1


                                                           [SPSS LOGO]

FOR IMMEDIATE RELEASE
Contact: Janine Warell
312-261-6535
jwarell@spss.com

                    SPSS INC. ANNOUNCES PROPOSED CONVERTIBLE
                                  NOTE OFFERING

CHICAGO, Ill., March 12, 2007 -- SPSS Inc. (NASDAQ: SPSS) today announced that
it intends to offer, subject to market and other conditions, approximately $125
million aggregate principal amount of convertible subordinated notes due 2012
through an offering to qualified institutional buyers pursuant to Rule 144A
under the Securities Act of 1933, as amended (the "Securities Act"). The
interest rate, conversion terms and offering price are to be determined by
negotiations between SPSS and the initial purchaser of the notes.

SPSS also intends to grant the initial purchaser of the notes a 30-day option to
purchase up to an additional $25 million aggregate principal amount of notes,
solely to cover over-allotments.

SPSS intends to use $50 million of the net proceeds from the offering to
purchase shares of its outstanding common stock in connection with this
offering. SPSS intends to use the remaining proceeds of this offering for
general corporate purposes, including potential acquisitions.

This press release does not constitute an offer to sell or the solicitation of
an offer to buy any of these securities and shall not constitute an offer,
solicitation or sale in any jurisdiction in which such offer, solicitation or
sale is unlawful.

The notes and the shares of common stock issuable upon conversion of the notes
have not been registered under the Securities Act or any state securities laws
and, unless so registered, may not be offered or sold in the United States
except pursuant to an exemption from the registration requirements of the
Securities Act and applicable state securities laws.


SAFE HARBOR STATEMENT

This press release contains forward-looking information made pursuant to the
safe harbor provisions of the Private Securities Litigation Reform Act of 1995.
Forward looking statements can be identified by phrases such as "anticipates,"
"believes," "estimates," "expects," "plans," "intends," "could," "designed,"
"should be" and other similar expressions which denote expectations of future
events rather than statements of fact. These forward-looking statements involve
factors that are subject to risks and uncertainties. These risks and
uncertainties, which may not be currently ascertainable and many of which are
beyond the Company's control, may cause the Company's actual results,
performance or achievements to be materially different than the results,
performance or achievements expressed in or implied by the forward-looking
statements. These risks and uncertainties are described in the Company's filings
with the Securities and Exchange Commission ("SEC"). Copies of these filings are
available either on the SEC's website at www.sec.gov or from the Company's
investor relations department. In light of these risks and uncertainties, the
inclusion of forward-looking statements in this press release should not be
regarded as a representation by the Company that any future results, performance
or achievements will be attained. These forward-looking statements speak only as
of the date on which they are made. The Company assumes no obligation to update
the forward-looking statements contained in this press release.