Wednesday July 23 4:21 PM EDT 
  Company Press Release
  Simulation Sciences Inc. Reports Second Quarter 1997 Results
  BREA, Calif.--(BUSINESS WIRE)--July 23, 1997--Simulation Sciences Inc. (Nasdaq:SMCI), a worldwide supplier of software and services to the process industries, Wednesday reported total revenue of $14.7 million and net income (excluding a $1.1 million one-time charge for in-process research and development costs) of $1.8 million, or 16 cents per share, for its second quarter ended June 30, 1997. 
  The one-time charge for in-process research and development is related to the previously announced acquisition of technology and assets from Raytheon Engineers & Constructors Inc. in the quarter. Including the one-time charge, net income for the quarter was $720,000, or 6 cents per share. In the second quarter of 1996, SIMSCI recorded total revenue of $11.8 million and net income of $543,000, or 7 cents per share. 
  For the six months ended June 30, 1997, total revenue was $28.3 million and net income (excluding $6.3 million in one-time charges for in-process research and development costs) was $3.3 million, or 29 cents per share. Including the one-time charge, the net loss for the period was $3.0 million, or 28 cents per share. For the six months ended June 30, 1996, total revenue was $21.8 million and net income was $810,000, or 10 cents per share. As discussed in the company's Form 10-K for 1996, the company's change in contract terms beginning in 1996 affects the comparability of total revenue. 
  The company noted that the record revenues benefited from the addition of new seats and new products to renewing contracts and the signing of new customers. Revenue mix changes in the quarter led to higher gross margins. In addition, as the company implemented a tax reduction program in the second quarter, its overall effective tax rate was reduced to 39 percent from 42 percent. 
  ``In addition to our strong financial performance, we made important strides this quarter in penetrating the chemicals market and expanding our technology base to provide best-in-class, on-line decision-support tools for the process industry,'' said Charles R. Harris, president and chief executive officer. 
  ``We are building a flexible enterprise optimization system based on the latest IT enabling technologies. The system is being designed to enable business managers with process operations responsibility to make better decisions based on more accurate and timely information about their processes and market economics. Our acquisitions this quarter have provided us with key technology components for this system,'' continued Harris. 
  ``Most recently we acquired on-line inferential estimator technology from Raytheon Engineers and Constructors Inc., which provides SIMSCI with a rigorous solution for on-line sensors. These sensors can replace costly on-line analytical instruments with accurate, easy-to-maintain software models. In addition, our agreements in the quarter with Shell Oil Co. have given us powerful advanced process control and business planning software, both essential components for enterprise optimization. The ROMeo product, which is being jointly developed with Shell, will be the first application based on our new enterprise optimization system architecture. ROMeo is designed to provide a common modeling environment for on-line process optimization and off-line simulation. 
  ``Through our Bayer AG agreement to purchase Simulation Manager, we not only gained key architectural components for our enterprise optimization system, but also the opportunity to develop our relationship with one of the world's leading chemical companies to develop new, more powerful applications designed to meet the needs of the chemicals market. Further, we believe Simulation Manager will have broad appeal across the process industry. Designed to enable different simulation applications to interoperate in a heterogeneous network, Simulation Manager meets a key need that many companies face in the chemicals, petrochemicals, refining and upstream markets. We intend to commercialize Simulation Manager and market it to the entire process industry.'' 
  ``Our growth has been strong in all regions of the world,'' added Harris, ``In addition to Bayer AG as a new chemical client in Europe, we also have signed a new contract with Mitsubishi Chemical Corp. and renewed license agreements with other chemical companies in Japan, a further indication of the value of our products in the chemical market. In Japan we also signed an agreement with the Japan National Oil Corp. (JNOC), to integrate JNOC's horizontal well simulation program, POPHOZN, with PIPEPHASE, SIMSCI's oil and gas production simulation program.'' 
  ``We also continued SIMSCI's enviable record of contract renewals at higher values. During the quarter, several long standing refining customers with large contracts renewed their license agreements with SIMSCI. These renewals underscore SIMSCI's value to the refining industry and our commitment to provide effective simulation-based solutions to help our clients design, operate and manage their processes more efficiently.'' 
  Simulation Sciences (SIMSCI) is a leading provider of commercial simulation software and related services to the petroleum, petrochemical and industrial chemical process industries as well as the engineering and construction firms that support those industries. SIMSCI's Windows-based graphical user interface and simulation software products are designed to increase profitability by reducing capital investment costs, improving yields and enhancing management decision making. SIMSCI maintains offices in the United States, Venezuela, Egypt, Germany, Singapore, the United Kingdom and Japan, and provides support and service to more than 650 customers in 70 countries. For more information about SIMSCI, visit the SIMSCI Website at simsci.com . 
  This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including statements with respect to products under development, new product capabilities, opportunities in connection with the acquisition of Simulation Manager, the ability of the company's products to improve customers' productivity and profitability and the extent to which, if at all, the company can expand market share, gain market acceptance and develop new products following the acquisitions. Actual results could differ materially from those projected in the forward-looking statements as a result of the following factors: the size and timing of customer orders, delays in renewals or failure of existing customers to renew their licenses with the company when their current licenses expire; the length of the company's sales cycle; changes in contract terms (including terms affecting the timing of recognition of license revenue) and the rate at which such changes are made; success of the company's service offerings; timing of new product announcements and introductions by the company and its competitors; the company's ability to develop, introduce and market new products and product enhancements; distractions and expenses associated with the acquisitions; market acceptance of the company's products; deferrals of customer orders in anticipation of new products or product enhancements; the company's ability to control costs, including the need for, and degree of use of, third-party contractors and the hiring of new employees; the availability of components; changes in the company's management team; and fluctuating economic conditions. Investors should also refer to the company's prospectus and reports on file with the Securities and Exchange Commission. 
                 Simulation Sciences Inc. and Subsidiaries                  Consolidated Statements of Operations                  (in thousands, except per share data)
                                    Three months ended   Six months ended                                         June 30,           June 30,                                    1996        1997    1996        1997                                      (Unaudited)         (Unaudited) Revenue   Software license revenue       $ 10,695  $ 14,229  $ 19,637  $ 26,926   Services and other revenue        1,068       479     2,154     1,417     Total revenue                  11,763    14,708    21,791    28,343 Cost of revenue   Cost of software license revenue    761       890     1,778     1,795   Cost of services and other revenue  680       459     1,553     1,305     Total cost of revenue           1,441     1,349     3,331     3,100 Gross profit                       10,322    13,359    18,460    25,243 Operating expenses   Sales and marketing               3,791     4,544     7,339     8,746   Research and development          4,146     4,081     6,845     7,501   General and administrative        1,599     2,314     3,066     4,476   In-process research and development         1,070               6,270     Total operating expenses        9,536    12,009    17,250    26,993 Income (loss) from operations         786     1,350     1,210    (1,750) Interest and other income             135       514       163       959 Income (loss) before provision  for income taxes                     921     1,864     1,373      (791) Provision for income taxes            378     1,144       563     2,213 Net income (loss)                  $  543    $  720    $  810  $ (3,004)
  Pro forma and net income  (loss) per share                  $ 0.07    $ 0.06    $ 0.10  $  (0.28)
  Pro forma and weighted  average common shares              7,765    11,341     7,765    10,791
                Pro forma information excluding in-process R & D
  Net income                         $  543  $  1,790    $  810  $  3,266
  Pro forma and net income per share $ 0.07  $   0.16    $ 0.10  $   0.29
  Pro forma and weighted  average common shares              7,765    11,341     7,765    11,208 -0-
                 Simulation Sciences Inc. and Subsidiaries                  Condensed Consolidated Balance Sheets                             (in thousands)
                                           Dec. 31,      June 30,                                           1996          1997                                                     (unaudited) Assets   Cash and investments                  $ 26,321     $ 14,927   Accounts receivable, net                 8,981       10,860   Unbilled accounts receivable, net        8,799       18,400   Property and equipment, net              4,045        4,406   Other assets                             5,052        7,902     Total assets                        $ 53,198     $ 56,495
  Liabilities and stockholders' equity   Liabilities                           $ 14,379     $ 15,743   Stockholders' equity                    38,819       40,752     Total liabilities and      stockholders' equity               $ 53,198     $ 56,495 |