|Original author(s)||Imagine That Inc.|
|Developer(s)||Imagine That Inc.|
|Operating system||Mac OS X 10.4 to 10.6, Windows XP, Vista, 7, 8|
|Type||Simulation & Optimization|
|License||Proprietary, Concurrent User Licensing|
ExtendSim (formerly known as Extend) is a simulation program for modeling discrete event, continuous, agent-based, and discrete rate processes. There are four ExtendSim packages: CP for continuous processes; OR (operations research) which adds discrete event; AT (advanced technology) which adds discrete rate, a number of advanced modeling features, and Stat::Fit for statistical distribution fitting; and Suite which adds 3D animation.
|1987||original release for continuous modeling on the Macintosh|
|1990||discrete event capabilities added|
|1995||release for Microsoft Windows|
|2008||discrete rate and 3D capabilities added|
Models are created by dragging 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 database. New blocks can be created by combining existing blocks into a single hierarchical block or by programming a block in ExtendSim's c-based language, ModL. The major libraries in ExtendSim are:
|Library name||Purpose||Sample blocks|
|Value||Mathematical calculations, remote data access, statistics collection||Math, Read, Write, Mean & Variance|
|Item||Models discrete event processes||Queue, Activity, Resource Pool, Item|
|Rate||Models discrete rate processes||Tank, Valve, Interchange|
|Plotter||Displays plots and charts||Plotter I/O, Histogram|
|Animation 2D 3D||Animates the model state||Animate Value, Animate 3D|
|Utilities||Model interface, debugging, and information||Buttons, Record Message, Memory Usage|
Sample applications include resource optimization for food logistics, six sigma process improvement for a hospital emergency department, communication systems, and manufacturing facility design 
- Discrete event simulation
- Computer model
- Process optimization
- Simulation software
- list of discrete event simulation software
- "Resource Optimization by Simulation Technique in Food Logistics" (PDF). Retrieved 2011-02-11.
- "Simulating Six Sigma Improvement Ideas for a Hospital Emergency Department" (PDF). Retrieved 2011-02-11.
- "NCW End-To-End (NETE) Model For Future C2 Architecture Assessments" (PDF). Retrieved 2011-02-14.
- "Facility Design: Simulation Methodology for Facility Design". Retrieved 2011-02-14.