Stella Professional is an easy, interactive tool that enables you to create a system diagram that can be simulated,
for systems such as health care delivery, energy cycle, ecosystems, business systems, and transportation.
Stella Professional gives you an efficient way to explore and build on your ideas, generate insight, share understanding,
and examine the results of your initiatives. A risk-free way to experiment with your system while viewing it holistically,
Stella Professional allows you to discover hidden aspects and behaviors/outcomes you did not expect. With Stella Professional’s
intuitive, user-friendly interface, you will get further faster in developing system models that help you make better decisions.
Dynamically explore model behavior using Stella Live™. Change any constants in the model by dialing
them up or down and immediately see the results for all objects displayed directly on the diagram
The Results Explorer allows you to easily analyze the results of each individual entity.
New capabilities include graphing of selected variables from selected runs, allowing the inclusion of
comparative and non-comparative results in a single graph or table
The Equation Error and Unit Error Lists allow you to quickly identify errors in your model. An expanded
list will show you the error and bring you directly to the problem to allow you to fix it
Gain complete control over all color, font styles, and title alignment
Keep your models clean and organized with all new Bezier Connectors. Avoid overlapping lines and
crossing over other objects by simply going around them
Easily align objects with the new Object Guides
The same software you know and love has a new coat of paint.
Put your tools where YOU need them with all new Panel Docking. All toolbars can easily be
dragged and placed along any of the four sides of your workspace to best fit your needs
Time stamp and track material as it flows through the model in order to precisely compute
how long different tasks and activities are taking
Mark a Converter as changing over time in response to changes in its input as happens
with SMTH1, SMTH3, DELAY, DELAY3 and related Builtins
Increased robust streams of values for the different random number Builtins. The new generator
is appropriate for use with high replication Monte-Carlo
CTFLOW, CTMEAN, CTMIN provides more robust streams of values for the different random number Builtins.
CTSTDDEV, CYCLETIME, THROUGHPUT as well as UNIFORM for random number generation and GAMMALN for statistical computations
Whatever runs are held by the data manager will immediately be displayed in
comparatives when you specify the variable
Keep your model files organized. Module files are stored in a folder prefixed with the model name so that you can save
a separate copy of a model using modules in file, without changing the original model
Intuitive icon-based graphical interface simplifies model building
Stock and Flow diagrams support the common language of Systems Thinking and provide insight into how systems work
Discrete and continuous processes with support for queues, ovens, and enhanced conveyors
Built-in functions facilitate mathematical, statistical, and logical operations
Modules support multi-level, hierarchical model structures that can serve as “building blocks” for model construction
XML-based model files support the new industry standard for common interchange of system dynamics models
Data Manager archives and recalls simulation run data stored in a separate SQLite database file
Sensitivity analysis reveals key leverage points and optimal conditions
Partial model simulations focus analysis on specific sectors or modules of the model
Simply focus on building the layout and engineering the design of your model without being distracted by equations or errors
Highlight outcomes with text, graphs, tables, and reports
Compatible with iThink/STELLA version 10.1 allowing you to design interfaces, publish and share your model over the web
using isee NetSim add-on software
A. Stella Professional requires any computer capable of running Windows Vista/Mac OS X 10.7 or higher.
A. Stella Professional is the next generation of all STELLA and iThink products. We are simplifying our
product offerings. Stella Professional 1.0 replaces the modeling (only) capabilities in both STELLA
and iThink 10.x. Stella Professional does not have an Interface Layer.
A. Yes, models can be shared between Stella Professional 1.0 and STELLA/iThink.
Models created and saved in versions of STELLA/iThink before version 10 cannot be used in Stella
Professional, you will need to save them from STELLA/iThink version 10.1 first. Stella Professional models
will not open correctly in STELLA/iThink versions earlier than 10.1.
A. Stella Professional and STELLA/iThink 10.1 have been designed to allow you to move models back
forth between the products. Because Stella Professional has a much richer set of capabilities around both
model appearance and graph/table support, there will be some differences in the way things look and the
way output is displayed. Editing models in one version of the software may cause changes to appear in the
other version that are not obvious when the editing occurs. For instance, the connector angles, as well as
stock and flow positions might move a small amount.
A. Stella Professional 1.0 does not have an interface layer. However, the models you develop in Stella
Professional can be used in both STELLA and iThink 10.1. This allows you to develop learning
environments and other interfaces that provide controlled interaction with your model. Although you cannot
see the interface in Stella Professional, the software is nonetheless aware of its content. This means that
any changes you make to variable names will be automatically reflected in any controls, graphs, or tables
referring to those variables. Changes to layout will also be reflected in any storytelling used in the interface.
Thus you can proceed with the ongoing development of both the model and interface without having to
continually redo what you have worked on so far.
A. We are currently working on a new interface development and publication environment that will run
alongside Stella Professional and allow you to generate high quality interfaces accessible on a variety of devices.
A. Stella Professional 1.0 and STELLA/iThink 10.1 use exactly the same simulation engine so speeds
are comparable. However, we have observed appreciable speed improvements with some models using Stella
Professional 1.0 vs. STELLA/iThink 10.1.
A. A list of improvements is available Here.
A. Stella Professional has a rich set of features. STELLA/iThink 10.1 has an interface layer that
enables you to build user interfaces on top of your model and share them using isee Runtime or isee Netsim.
A. Purchase a STELLA 10 K-12 Teacher and it will include Stella Professional.
A. Without an interface layer, models cannot be published to the web with isee NetSim. By
Stella Professional model in STELLA or iThink 10.1, you can add an interface to your model and publish with NetSim.
A. Instructions for sharing models can be found Here.
A. Coming soon...
A. Unfortunately, we do not currently offer a trial version of Stella Professional. Serious enquiries should be
directed to firstname.lastname@example.org.
A. A. You can purchase just Stella Professional. However, if you want to create a user interface for your
model, you will also need STELLA or iThink 10.1. Note that STELLA/iThink 10.1 both include a license for
A. Yes you can upgrade your older license and that will include Stella Professional 1.0.
A. isee Runtime works with models that have a user interface. You can open a Stella Professional file in
STELLA/iThink 10.1 to add an interface.
A. No. Stella Professional is included under your STELLA/iThink 10 support.
A. While Stella Professional adds many modeling and diagramming features, it does not include an
Interface Layer that allows you to build user interfaces for your models that can be distributed using isee
Runtime or isee NetSim. At present, this capability is only available in STELLA/iThink 10.1.