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Original author(s)Imagine That Inc.
Developer(s)Imagine That Inc.
Stable release
ExtendSim 9.2
Operating systemMac OS X 10.4 to 10.6, Windows XP, Vista, 7, 8
Available inEnglish
TypeSimulation & Optimization
LicenseProprietary, 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 for statistical distribution fitting; and Suite which adds 3D animation.


Year Features added
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

Model construction[edit]

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

Application areas[edit]

Sample applications include resource optimization for food logistics,[1] six sigma process improvement for a hospital emergency department,[2] communication systems,[3] and manufacturing facility design [4]

See also[edit]


  1. ^ "Resource Optimization by Simulation Technique in Food Logistics" (PDF). Retrieved 2011-02-11.
  2. ^ "Simulating Six Sigma Improvement Ideas for a Hospital Emergency Department" (PDF). Retrieved 2011-02-11.
  3. ^ "NCW End-To-End (NETE) Model For Future C2 Architecture Assessments" (PDF). Retrieved 2011-02-14.
  4. ^ "Facility Design: Simulation Methodology for Facility Design". Retrieved 2011-02-14.

External links[edit]