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<h2 id="history">History</h2> <table><tbody><tr><th>Year</th><th>Features added</th></tr><tr><td>1987</td><td>Original release for continuous modeling on the Macintosh</td></tr><tr><td>1989</td><td><a href="/facts/Discrete-event_simulation/gQjkaft8">Discrete event</a> capabilities added</td></tr><tr><td>1992</td><td><a href="/facts/Hierarchy/mYJyqFrG">Hierarchical</a> modeling, <a href="/facts/Cloning_(programming)/3ShnR7RM">Cloning</a>, Animation, Interactivity</td></tr><tr><td>1994</td><td><a href="/facts/Sensitivity_analysis/X9x3WAnK">Sensitivity Analysis</a>, interface to <a href="/facts/Microsoft_Excel/Ezal6G75">Microsoft Excel</a></td></tr><tr><td>1995</td><td>Release for Microsoft Windows</td></tr><tr><td>1998</td><td><a href="/facts/Scripting_language/8pF4ajBL">Scripting</a>, <a href="/facts/Activity-based_costing/jVh1wQIa">Activity-Based Costing</a></td></tr><tr><td>2001</td><td><a href="/facts/Mathematical_optimization/oRn8Iv5I">Optimizer</a>, <a href="/facts/ActiveX_component/xJb7t7Eh">ActiveX/COM</a> and <a href="/facts/Open_Database_Connectivity/2dV2Fm5j">ODBC</a> support, source code debugger</td></tr><tr><td>2002</td><td><a href="/facts/File_Transfer_Protocol/THuWgzfw">FTP</a> support</td></tr><tr><td>2007</td><td>Changed product name from Extend to ExtendSim, internal database</td></tr><tr><td>2008</td><td><a href="/facts/Discrete_rate_simulation/QCvghlkf">Discrete rate</a> and 3D capabilities added</td></tr><tr><td>2010</td><td>Scenario Manager, Advanced Resource Manager</td></tr><tr><td>2013</td><td><a href="/facts/ActiveX_Data_Objects/dU8V95sx">ADO</a> database support, Flow attributes</td></tr><tr><td>2018</td><td>Integrated reliability diagramming, <a href="https://extendsim.com/cloud">ExtendSim Cloud</a> released</td></tr><tr><td>2024</td><td>Multicore Analysis to run models in parallel and launch multiple instances of ExtendSim</td></tr></tbody></table> <h2 id="model-construction">Model construction</h2> <p>Models are created by placing blocks from a library into a model worksheet. Blocks are connected together to create the logical flow of the model. Data for the model resides in the parameters of the blocks and in a proprietary <a href="/facts/Database/VYcpkevb">database</a>. New blocks can be created by combining existing blocks into a single hierarchical block or by programming a block in ExtendSim's <a href="/facts/C_(programming_language)/Ky2No763">C-based</a> language, ModL. The major libraries in ExtendSim are: </p> <table><tbody><tr><th>Library name</th><th>Purpose</th><th>Sample blocks</th></tr><tr><td>Value</td><td>Mathematical calculations, remote data access, statistics collection</td><td>Math, Equation, Decision, Random Number, Read, Write, Mean & Variance</td></tr><tr><td>Item</td><td>Models discrete event processes</td><td>Queue, Activity, Equation, Create, Batch & Unbatch, Resource Management, Select Item In & Out</td></tr><tr><td>Rate</td><td>Models discrete rate processes for high-speed, high-volume simulation</td><td>Tank, Valve, Interchange, Convey Flow, Merge & Diverge, Throw & Catch Flow</td></tr><tr><td>Reliability</td><td>Reliability block diagramming</td><td>Start Node, Component, End Node, Event Builder, Distribution Builder</td></tr><tr><td>Chart</td><td>Displays plots and charts</td><td>Bar, Scatter, Histogram, Line, and Database Line, Database Statistics</td></tr><tr><td>Report</td><td>Reporting model results</td><td>Reports Manager, Cost Stats, Item Log Manager</td></tr><tr><td>Analysis</td><td>Organizing and optimizing model data and results, plus launching multiple instances of ExtendSim</td><td>Analysis Manager, Multicore Analysis, Optimizer, Scenario Manager</td></tr><tr><td>Utilities</td><td>Model interface, debugging, and information</td><td>Buttons, Record Message, Memory Usage</td></tr></tbody></table> <h2 id="application-areas">Application areas</h2> <p>Sample applications include resource optimization for food logistics,<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a> <a href="/facts/Six_sigma/ctasMp3w">six sigma</a> process improvement for a hospital <a href="/facts/Emergency_department/Qo4NcDeP">emergency department</a>,<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> communication systems,<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> and manufacturing facility design <a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Discrete_event_simulation/gQjkaft8">Discrete event simulation</a></li> <li><a href="/facts/Discrete_rate_simulation/QCvghlkf">Discrete rate simulation</a></li> <li><a href="/facts/Computer_model/Re6o8vzN">Computer model</a></li> <li><a href="/facts/Process_optimization/2Mu4Vevd">Process optimization</a></li> <li><a href="/facts/Simulation_software/NWtwRtT4">Simulation software</a></li> <li><a href="/facts/List_of_discrete_event_simulation_software/asf7998x">list of discrete event simulation software</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.extendsim.com">Official website</a></li> <li><a href="http://www.simulationsoftware.blogspot.com">ExtendSim blog</a></li> <li><a href="https://mash-pandemics.vse.gmu.edu/">MASH-Pandemics - a portal to support Models for Assessing Strategies for Hospitals</a></li> <li><a href="http://www.spicosa.eu/simulation/index.htm">SPICOSA page on ExtendSim</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Resource Optimization by Simulation Technique in Food Logistics" (PDF). Archived from the original (PDF) on 2011-07-20. Retrieved 2011-02-11. <a href="https://web.archive.org/web/20110720053650/http://www.ecology.kee.hu/pdf/0501_189200.pdf" target="_blank">https://web.archive.org/web/20110720053650/http://www.ecology.kee.hu/pdf/0501_189200.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Simulating Six Sigma Improvement Ideas for a Hospital Emergency Department" (PDF). Retrieved 2011-02-11. <a href="http://www.informs-sim.org/wsc03papers/250.pdf" target="_blank">http://www.informs-sim.org/wsc03papers/250.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"NCW End-To-End (NETE) Model For Future C2 Architecture Assessments" (PDF). Retrieved 2011-02-14. <a href="http://www.dodccrp.org/events/10th_ICCRTS/CD/papers/141.pdf" target="_blank">http://www.dodccrp.org/events/10th_ICCRTS/CD/papers/141.pdf</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Facility Design: Simulation Methodology for Facility Design". Archived from the original on 2011-10-03. Retrieved 2011-02-14. <a href="https://web.archive.org/web/20111003213541/http://biopharminternational.findpharma.com/biopharm/article/articleDetail.jsp?id=432392" target="_blank">https://web.archive.org/web/20111003213541/http://biopharminternational.findpharma.com/biopharm/article/articleDetail.jsp?id=432392</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>