Siebel Systems Introduces New Self-Assessment Tool for Customer Experience Blueprint

New Tool Guides Users through Six-Step Blueprint Life Cycle to Accelerate Successful Deployment of Customer-Facing Projects

Siebel CustomerWorld, BOSTON - October 17, 2005 - Siebel Systems, Inc. (NASDAQ: SEBL), a leading provider of customer-facing solutions, today announced a new online Self-Assessment Tool that will enhance the success of customer-facing projects by helping organizations of all types and sizes determine their preparedness and readiness to complete each stage of the Siebel Customer Experience Blueprint (CEB). Introduced one year ago at Siebel’s User Week conference in Los Angeles, the CEB is a comprehensive six-step process that Siebel recommends all organizations follow to build their business around their customers and achieve concrete, measurable business outcomes from their front-office solutions. Distilled from Siebel’s 11-plus years of CRM experience with more than 4,000 customers and 3.7 million users, the CEB provides clearly defined steps and activities organizations need to complete in order to maximize the success of their front-office transformations.

The CEB is a critical element underlying Siebel’s new Customer Adaptive Applications Strategy and Architecture, announced separately today. Siebel Customer Adaptive Solutions enable organizations to better understand and adapt to the needs of their customers in response to rapidly changing business requirements (see separate press release for additional information).

“This new Self-Assessment Tool is an excellent resource for Siebel customers and CRM users in general,” said Peter McCullagh, Group Vice President, Customer Strategy, Siebel Systems. “Any front-office transformation involves more than just a technology solution, and it is precisely for this reason that we have identified activities in this new tool that span strategy, people, process, technology, and governance areas. This will illustrate the full scope of activities that organizations need to undertake in order to drive maximum returns from their CRM investments. We are excited to offer this capability, which further leverages Siebel’s domain expertise and makes it available for organizations of all types and sizes. This is the first of many Blueprint-specific diagnostic tools we will unveil to help our customers address front-office specific opportunities and challenges, and we look forward to continuing to provide our customers with more tools and resources.”

Just as a blueprint guides a contractor through each phase of construction, the CEB guides organizations through the process of developing and implementing customer-facing solutions. At each stage of the Blueprint, there are checklist items, or activities that customers should complete before a project can proceed to the next stage. These checklists help organizations determine where they are in the Blueprint life cycle. By using these checklists to guide their progress, organizations will minimize the risks associated with implementing their customer-facing solution.

The new CEB Self-Assessment Tool helps to enable this process by allowing customers to audit their own efforts by providing inputs and receiving a report of their Blueprint readiness at their convenience, on a secure site. Customers can review checklists, sample deliverables and details behind each stage of the Blueprint, and receive a quick summary of the gaps in their front-office transformation efforts with recommended actions to address these gaps. More information about the CEB and the Self-Assessment Tool is available at www.siebel.com/blueprint.
About Siebel Systems

Siebel Systems is a leading provider of customer-facing solutions that deliver demonstrable business results and long-term competitive advantage. Siebel’s multichannel offerings allow organizations to intelligently manage and coordinate all customer interactions across the Web, contact center, field sales/service force, branch/retail network, and indirect and partner distribution channels. Siebel solutions draw upon the company’s best-in-class capabilities in customer relationship management (CRM), business intelligence, and customer data integration and can be deployed as licensed software or as a hosted service. Siebel solutions are tailored to the unique needs of 23 industries and incorporate industry-specific business processes, best practices, and business insight. They are the product of more than $2 billion in R&D investments and reflect over 11 years of experience with more than 4,000 organizations. Together with its extensive global network of alliance partners, Siebel provides the people, process, and technology expertise critical in driving business value from the deployment of customer-facing solutions. Over 3.4 million users worldwide in organizations of all sizes depend on Siebel solutions to deliver dramatic improvements in how they identify, acquire, retain, and serve customers. For more information, visit www.siebel.com.

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For more information on Siebel Systems solutions and services, please visit our Web site:
CRM - http://www.siebel.com/crm;
OnDemand Solutions - http://www.crmondemand.com;
Industry CRM - http://www.siebel.com/industry-crm;
Call Center & Service - http://www.siebel.com/call-center;
Sales Force Automation - http://www.siebel.com/sales-force-automation;
Marketing Automation - http://www.siebel.com/marketing-automation;
Business Intelligence - http://www.siebel.com/business-intelligence;
Integration Solutions - http://www.siebel.com/integration-s olutions;
CRM Services - http://www.siebel.com/crm-services.

Except for the historical information contained herein, this press release contains forward-looking statements that involve risk or uncertainties. Future operating results of Siebel Systems may differ from the results discussed or forecasted in the forward-looking statements due to factors that include, but are not limited to, risks associated with customer relations, such as the availability of Siebel Systems’ products and services, customer implementation of products and services, relationships with customers, third-party vendors and systems integrators, concentration of revenues in a relatively small number of customers, existence of errors or defects in products, ability to successfully manage growth, significant current and expected additional competition and the need to continue to expand product distribution and services offerings. Further information on potential factors that could affect the financial results of Siebel Systems are included in Siebel Systems’ Annua l Report on Form 10-K, Quarterly Reports on Form 10-Q and its other filings with the Securities and Exchange Commission, which are available at www.sec.gov. Siebel Systems assumes no obligation to update the information in this press release.

Siebel is a trademark of Siebel Systems, Inc. and may be registered in certain jurisdictions. All other product and company names mentioned are the property of their respective owners and are mentioned for identification purposes only.

Contact Information

Ari Entin

Bite Communications

Siebel Systems, Inc.

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