The acslXtreme Excel Simulation Interface is an add-in utility for Microsoft Excel which allows models created in acslXtreme to be controlled and analyzed using Microsoft Excel. The AEgis Technologies Group, a leading supplier of simulation software, training, and engineering services to the international modeling and simulation community, announces the release of the Microsoft Excel Add-in for acslXtreme. The acslXtreme Excel Simulation Interface is an add-in utility for Microsoft Excel which allows models created in acslXtreme to be controlled and analyzed using Microsoft Excel. This utility works by associating cells in an Excel workbook with specific model variables. In particular, cells associated with model constants can be used to specify the values of those constants prior to a simulation run; model outputs of interest may similarly be collected and inserted into specific cells at the conclusion of the run. Since the model inputs and outputs are simple Excel cells, the complete mathematical, plotting and data import/export facilities provided by Excel may be used in the analysis of acslXtreme simulation data. The acslXtreme Excel Add-in works with models created using the latest version of acslXtreme, the award-winning environment for integrated, end-to-end model development, simulation execution, and results analysis. In acslXtreme, models are specified using either familiar block diagram notation, or code-based descriptions based on the CSL modeling language. By default, all model representations are translated into C or FORTRAN language source code for compilation and execution, ensuring the fastest possible performance and support for extremely large or complex models. Open application programming interfaces (APIs) are provided throughout the system to extend acslXtreme functionality, allow the integration of custom or legacy code within acslXtreme models, or to embed the generated simulation into end-user applications. Model code reuse is supported through easily creatable user-defined libraries of simulation blocks. acslXtreme provides a powerful simulation control scripting language and mathematical analysis environment based on the popular M-File language. The latest version of acslXtreme introduces an array of new features including out-of-the-box support for parallel cluster/grid computing, advanced parameter estimation capabilities such as Markov Chain Monte-Carlo analysis, database connectivity support, and an assortment of utilities for model documentation and data post-processing. This release additionally incorporates numerous performance and stability improvements throughout the product. Version 2.3 of acslXtreme continues the tradition of its predecessor, ACSL, which was one of the first commercially available modeling and simulation tools designed for simulating continuous systems. ACSL has been validated through more than 25 years of continuous use by the world's most demanding simulation professionals in fields including aerospace engineering, toxicology/pharmacology, industrial process modeling, financial and automotive design. For additional information, or to request a free trial of acslXtreme and/or acslXpress, please visit its Web site, or contact AEgis at 1-800-647-ACSL.