STELLA and iThink Version 10.1 Release NotesThank you for upgrading to Version 10.1. This is a significant upgrade to version 10.0.6 thatincludes new features, updates, and a number of defect fixes. Version 10.1 is also compatiblewith Stella Professional Version 1 and allows you to share models back and forth between thetwo product families.

New Features in Version 10.1

Updates to Existing Features

Translating Models from a Previous Version

Defects Fixed

Known Issues in this Release

System Requirements

Technical Support

STELLA and iThink from isee systems, the world leader in Systems Thinking software.

New Features in Version 10.1Version 10.1 offers the following features to enhance your ability to build, share, and learn fromiThink and STELLA models:

Cycle Time

Cycle Time lets you time stamp and track material as it flows though the model in order to pre-cisely compute how long different tasks and activities are taking.

Delay Converters

You can identify Converters as changing over time in response to changes in its input as hap-pens with SMTH1, SMTH3, DELAY, DELAY3 and related Builtins. A Delay Converter shows a boxinside the regular Converter circle indicating it has some of the properties of a Stock. Because ithas properties of a stock it is possible for Delay Converters to be involved in feedback loops inwhich no explicit Stock exists.

Sketchable Graphs

Graphs can now take user input: you can create a sketch of the expected behavior of a modelvariable over time. When the simulation is run, you will be able to compare your sketch to theactual behavior of the variable. Sketchable graphs come in handy when you want users of yourmodel to "put a stake in the ground" regarding the performance of the model. Discrepanciesbetween expected and actual performance can motivate effective, efficient learning exper-iences.

Stella Live™ on the Interface

You can now create Interfaces for which the model constantly reruns whenever the user movesa slider or changes any other control. The lets users see how overall model behavior unfolds inresponse to their actions with graphs and tables updating instantly as changes are made.

Interface Control Shading

It is now possible to turn off shading for interface controls giving a cleaner more modern appear-ance to interfaces - supported on both the Desktop and Netsim. Use the Interface preferencesdialog to change this.

Individually Controlled Tables

Tables now store information about reporting period and type of reporting individually so youcan have different tables with different settings. Rerunning the model is no longer necessarywhen changing the report interval and other reporting options.

Compatibility with Stella Professional

Version 10.1 supports the use of models created in Stella Professional and maintains model ele-ments that have been customized in Stella Professional (such as fonts, sizes, and specializedlayout with bezier curves). This allows you to do model development work in Stella Professionaland Interface development work in Version 10.1.

New Features Relative to Version 9

Panels

Side-docked panels allow you to define and edit properties for model entities while still viewingthe diagram. Drag-and-drop entities from the diagram into equations to use as variables.Undock the panel to create a floating window that you can resize and place anywhere on yourscreen.

Multi-dimensional arrays

Expanded array capabilities provide more flexibility defining array equations, creating arrayedgraphical functions, and entering constants across an array. Create up to ten dimensions forarrayed entities. Index array elements by number or label. Use the new Array Editor to easilyimport or paste element labels from a spreadsheet or comma/tab-separated list.

Data Manager

The new Data Manager allows you to archive and recall simulation results. Name and save rundata from different scenarios or sensitivity tests to easily identify and reload results. Simulationdata is stored in a separate SQLite database file and accessible using standard database tools.

Embedded modules

Hierarchical modules are now embedded in a single model file by default. For collaborativemodel building and creation of reusable templates, use the option to automatically save mod-ules as separate files.

Statistical built-in functions

COMBINATIONS, FACTORIAL, INVNORM and PERMUTATIONS have been added to the list of stat-istical built-in functions. New stochastic distributions include BETA, BINOMIAL, GEOMETRIC,GAMMA, LOGISTIC, PARETO, TRIANGULAR, and WEIBULL.

Rich text documentation

Source information and other details about model variables can be documented in rich tex-t/HTML format using options available in the new Documentation panel.

Improved conveyor leakage

Conveyors now support multiple leakage flows. Use additional leak zone options to simplifymain chain structures that contain cohorts with varying leakage fractions.

Expanded Find functionality

Use the new Find palette to locate model entities using string search, hierarchical views, and fil-tering capabilities. Drag and drop variables from the palette directly into variable equations andinput/output devices.

New graphical function options

Edit the input values (X-axis) of graphical functions to align with your data. Use the new con-tinuous extrapolation option to linearly extrapolate values that are beyond the graphed curve.

Industry standard XMILE format 

Model files support the new industry standard (XMILE) for common interchange of systemdynamics models. Use any text or XML editor to search, edit or document your model.

More powerful modeling engine (STEAM)

The new STEAM engine does not place limits on the number of variables, data points and/ortime steps. This new more powerful and flexible engine will provide a solid foundation for futuredevelopment and expanded functionality of iThink and STELLA.

Updates to Existing FeaturesThe following enhancements to existing features were added in Version 10.1:

n New sensitivity analysis supports full Monte Carlo allowing for a broad range of dis-tributions in specifying input changes.

n Specifying units is more flexible and comprehensive with a new Unit Editor and improvedsyntax capabilities. It is now possible to define multiple aliases for a unit of measure sothat you have more flexibility in expressing compound units.When checking units the mes-sages provide better feedback on issues in dimensional consistency.

n Run speed has been improved significantly, especially for large models with many graphsand tables.

n The Find dialog has been enhanced with the following:n It will identify subtypes including cross level ghosts, graphical functions, invalid entit-ies, sector frames, discrete stocks, delay converters, summing converters.

n You can now filter on sectors, invalid and valid entities.

n Modules saved to separate files are now put in a folder prefixed with the model name (asin MyModel_Modules) so that Save As will not overwrite the old modules.

n New options have been added to Run Specs to let you better control the reporting of val-ues. Specifically, you now have control over whether flows are converters are computedwhen the model is paused and whether to record interpolated flow values when usingRunga-Kutta integration.

n Both error notification and usability have been improved for the Equation panel.

n There is more error checking on array usage both in equations and when connectingstocks with different dimensions.

n There is more flexibility when importing data into Graphical Functions on the equationpanel including automatic transposition of xy pairs laid out in rows.

n The import format now allows specification of array slices and importation of only someelements of an array.

n Both STELLA and iThink will open .itmx and .stmx files without needing to rename them.

The following enhancements to existing features were added in Version 10.0.5:

n The equation editor will automatically close when you click on any part of the diagram offof an entity. There is an optional pin to keep it open.

n When editing arrayed variables with multiple equations the editing box will position itselfto allow easy equation entry.

n When editing points in graphical functions you can now select, copy and paste to subsetsof the y axis. To fill multiple cells with a single value type it in, copy it, select the targetcells for filling and paste.

n Circularity reports now show all model elements involved in the circularity.

n The data manager has been rewritten to improve performance. Sensitivity runs, espe-cially, will be much faster and there will not be any slowdown after multiple runs.

n Models open more quickly and run more quickly.

n The sensitivity specs setup allow for the use of arrayed variables (though Apply-to-All con-stants will all be changed together).

The following enhancements to existing features were added in Version 10.0.4:

n The Model Preferences dialog has a new option to show local names of cross-level ghosts.Selecting this option will display both the local name and (in parentheses) the cross-levelghost name. Equations using cross level ghosts are also simplified by using the local nameinstead of the fully-qualified cross-level ghost name.

n Cross-level throughputs that accept input from one module and provide output to anotherare now valid.

n The number of runs that can be saved in the Data Manager has been expanded from 99 to10,000.

n The default names of entities are now distinguished by type, for example, Stock 1, Flow 1and Converter 1.

n Circularity checking has been improved to recognize delay functions in equations includingDELAY, DELAY1, DELAY3, DELAYN, FORCST, SMTH1, SMTH3, SMTHN and TREND.

The following enhancements to existing features were added in Version 10.0.3:

n Data import and export now supports n-dimensional arrays.

n Locked models are now encrypted within the model file. A new high security option in theSecurity Preferences dialog requires a password to open (and decrypt) the model.

n The Finder palette now displays a ? in the icon of a model entity that is not defined.

n Analyze mode is now an option in the Run Specs dialog. By default, analyze mode isenabled so that model output for ALL model variables is stored in computer memory. Dis-abling analyze mode will conserve computer memory by ONLY storing model output forvariables assigned to an output device such as a graph or table. Models with a large num-ber of entities, a long simulation period or a very small DT will run faster and more effi-ciently when analyze mode is turned off.

n Multiple performance improvements have made opening, running and saving modelsfaster and more efficient.

The following enhancements to existing features were added in Version 10.0.1:

n The new Message panel now supports message posting with new options for frequency ofposting.

n Summing converters are now fully supported. Drag entities from the diagram or the Findpalette into the Inputs list to easily define the equation for a summing converter.

n Export for NetSim now supports all available builtins, multi-dimensional arrays, queues,ovens, and all conveyor functionality.

Translating ModelsOpening a STELLA or iThink model that was created in a previous version will automaticallytranslate the model so that it is compatible with version 10. In some cases, the translationrequires additional manual updates to the model. We recommend using the model diagnosticsfeature in previous versions to verify and repair models before opening them in version 10.

Due to encoding differences between Windows and Mac, models should be translated using thesame operating system that was used to author the original model. Opening a version 9 modelthat was created on a Windows computer may not translate correctly on a Macintosh computerand vice versa.

Below are details about how the software handles specific translation issues.

1. Variables with equations containing builtins that have been renamed, modified orremoved will automatically translate as follows:

Prior Version Format Version 10 TranslationARRAYIDX() Dimension_NameARRAYMAX(array[*]) MAX(array)ARRAYMAXIDX(array[*]) RANK(array, SIZE(array))ARRAYMEAN(array[*]) MEAN(array)ARRAYMIN(array[*]) MIN(array)ARRAYMINIDX(array[*]) RANK(array, 1)ARRAYRANK(array[*],x) RANK(array, x)ARRAYSTDDEV(array[*]) STDDEV(array)ARRAYSUM(array[*]) SUM(array)ARRAYVALUE(array[*],x) array[x]CAP(Conveyor) CAPACITY(Conveyor)COOKTIME(Oven) PROCTIME(Oven)DIMSIZE() SIZE(SELF)DIMSIZE(array[*]) SIZE(array)LOGN(x) LN(x)MOD(x, y) x MOD yPAUSE Message posterPCT(x) PERCENT(x)QELEM(Conveyor,x) Conveyor[x]QLEN(Queue) SIZE(Queue)SUM(x,y,z) (x + y + z)SWITCH(x,y) (x > y)

Prior Version Format Version 10 TranslationTRANSTIME(Conveyor) PROCTIME(Conveyor)MIN(x,y,z) MIN(x,MIN(y,z))MAX(x,y,z) MAX(x,MAX(y,z))

2. Variables with equations containing builtins that are not supported in this release, includ-ing SOUND, will no longer be valid when opened in version 10. A manual change to theequations for these variables is required for the model to run. Note also that equationspassing an argument to ARRAYIDX will need to be translated by hand (see brief descrip-tion below).

3. Decision process diamonds and sub-models will be converted to modules when opened inversion 10. Repositioning of model entities and other manual changes may be required.

4. If a model entity has the same name as an array dimension name, the entity name is nolonger valid in equations. Model entities with the same name as array dimension namesmust be renamed for equations to be valid.

5. Dimension element names that start with 1 and continue consecutively will translate to adimension indexed by number. Anything else will translate to a dimension indexed bylabel.

6. Element labels in version 10 cannot be numbers or begin with a number. If you have amodel created in a previous version with element names that are not consecutive startingfrom 1, open the model in the previous version and put a letter in front of each elementname so that the model will translate correctly.

7. If a conveyor name is in the equation for the transit time, it will not translate correctly. Tocorrect this issue, open the model in the previous version and create a converter that isassigned the same value as the conveyor. Use the newly created converter to definetransit time so that the model will translate correctly in version 10.

8. If an oven name is in the equation for its cook time, it will not translate correctly. To cor-rect this issue, open the model in the previous version and create a converter that isassigned the same value as the oven. Use the newly created converter to define cooktime so that the model will translate correctly in version 10.

9. Documentation for an arrayed variable now applies to all elements of the array. Opening amodel saved in a previous version with multiple documents in an arrayed variable, onlyretains one of the documents.

10. Sector names that are no longer valid will automatically be renamed.

11. If a model created in a previous version uses a cross-level ghost in an equation for theArrest option, version 10 will not correctly translate the fully qualified name of the ghostedentity. Equations that use cross-level ghosts for the Arrest option will need to be manuallyupdated in version 10.

12. Graphical Input Devices assigned to Apply to All arrayed entities will no longer beassigned when the model is opened in version 10. To achieve the same functionality, cre-ate a non-arrayed graphical function and use that to define the equation of the Apply to Allentity. (The Apply to All entity should not be a graphical function.) Assign the newly cre-ated graphical function to the Graphical Input Device.

13. The Builtins DT, INF, PI, STARTTIME, STOPTIME and TIME can no longer be optionally fol-lowed by empty parentheses (). Just remove the parentheses to make the equations validin version 10.

Defects FixedThe following defects were fixed in Version 10.1

n Preferences, including toolbar color choices, were not being maintained between sessions.

n A number of issues in copy and paste including proper array management and dealing withghosts.

n Missing data in tables and graphs after reopening a model.

n Problems with array editing including renaming and its propagation through equations.

n Transient run issues that could occur in models with transit times depending on stocks.

n Renaming of transit times and conveyor capacities was not propagating to the conveyoritself.

n Adding a variable that already appears in stock equation now updates the stock's validity.

n Imex was not always working with Excel on the Mac.

n Teamweaver software would cause crashes with STELLA and iThink on Windows.

n Queues that could go slightly negative due to rounding problems

n Non-negative stocks could be initialized with negative values.

n Circularity involving transit times and conveyor outflows was not being detected.

n Graphical function editor would sometimes redistributed X values evenly even whenX,Y pairs had been entered.

n Calling statistical functions with invalid ranges could cause simulations to hang.

n The controller symbol was not always being drawn on arrays with controls on the interfacelayer.

n Dimension name changes were not checking against Builtins.

n The model state after restore all devices was not persisting after saving and reopening amodel.

n Message posters were sometimes delayed by a DT.

n Data manage was not correctly displaying run times

n Multiple poster displays firing at the same time would not cycle properly through the list.

n GFID icons were not always displaying the correct curve for the underlying graphical func-tion.

The following defects were fixed in Version 10.0.6

n Corrected an issue introduced in Version 10.0.5 where memory could be corrupted whenusing the Graph dialog causing the application to stop working at a random point there-after.

n Run By Sector was not working when there were undefined entities in sectors that werenot being run.

n Buttons using the "Run/Restore" menu item now work properly.

n Linear initialization for a leak zone in first half of a conveyor was overstating the com-puted loss.

n Windows only: Larger models would show empty allowable lists in some dialogs. Theselists will now populate, but will be truncated after 16383 allowable list items.

n Corrected Version 10.0.5 issue where Pause Interval was ignored when Sim Speed wasset to zero.

n Graph curves were sometimes incompletely drawn when the simulation was paused.

The following defects were fixed in Version 10.0.5

n The cursor no longer gets stuck when editing equations.

n When an dimension element label is changed in the array editor, and that same label isused in another dimension, equations will now only be updated for the dimension changed.

n Buttons that navigate out of modules now work properly.

n Exporting modules for NetSim now works with models that have nested modules.

n Closing models with import/export links will no longer leave a background Excel processrunning.

n The Find Menu option for buttons is now working.

n A number of problems opening and closing version 9 models have been corrected.

n Graphs and tables are properly populated with values in models that do not use analyzemode.

n Several issues with copying and pasting have been corrected.

n Cross level ghosts are now being properly saved with the appropriate module con-nections.

n Models with no shape selected for convertors no longer have some names missing whenfirst viewed.

n Changes to the equations for a constant or the graphical function will now properly propag-ate to the interface layer.

The following defects were fixed in Version 10.0.4

n The window size for models saved on computers with larger screens now automaticallyresize when opened on computers with smaller screens.

n Fixed a problem introduced in Version 10.0.3 where 'Restore Graphs & Tables' and'Restore All Devices' did not restore hover values.

n Corrected a problem introduced in Version 10.0.3 where the font style for text boxes andbuttons was not being read properly on Macintosh computers.

n Corrected a problem introduced in Version 10.0.3 where the scale on a Graphical InputDevice was not being saved correctly.

n Validation of pause interval values now calculates correctly.

n Scientific notation format used to define the minimum and maximum values for the X or Yaxis of a graphical function is now retained.

n Comparative graphs and tables inside a module now correctly display data for cross-levelghosts.

n Importing a model that contains process frames into a module no longer causes the soft-ware to fail upon closing.

n Saving a model with a storytelling sequence that contains a cross-level ghost no longercauses the software to fail.

n Using the HISTORY builtin to define a variable inside a module no longer causes the sim-ulation to fail when analyze mode is disabled.

n Fixed a problem using the PREVIOUS builtin with an 'Apply To All' arrayed variable thatcaused the software to fail.

n Equations that use multi-dimensional array entities now automatically update when anarray element name has been edited.

n Unit checking now works correctly for variables inside a sector frame.

n Right-clicking on an entity that has units assigned and selecting 'Unit Editor', no longercauses a crash on Macintosh computers.

n Values assigned to entities in the Sensitivity Specs dialog using the Paste data option nowsave correctly.

n Corrected a problem with the interface objects bleeding through graphics assigned to mes-sage posters.

n Media poster messages with assigned navigation now save properly.

n Ghosted entities now copy and paste correctly.

n Documentation associated with Modules, Sectors and Process Frames now saves cor-rectly.

n Dragging an entity from the Find palette into the equation of an entity inside a module,now works correctly.

n The navigation button option to 'Enable Model Layer Toolbar in Runtime' now saves cor-rectly.

n The "On/Off" Switch option in the Status Indicator dialog now saves correctly.

n The Show Name option in the Switch dialog now appears properly.

n Setting the scale in the Define Graph dialog no longer clears the Allowable list on a newgraph page.

n Fixed a problem when opening some models on a Macintosh computer that incorrectlycaused a 'Picture file not found' error message to appear.

n Other miscellaneous bug fixes.

The following defects were fixed in Version 10.0.3

n Entity names with a backslash (\) are now being read properly when opening a model.

n Opening a model on the Model layer by double-clicking on the file, no longer opens the pan-els as though you were on the Map level with only the Documentation tab showing.

n Data export is no longer limited to 255 column when using a version of Excel more recentthan 2003.

n Sectors now copy and paste correctly.

n Units specified for a variable in a Table or Status Indicator now save correctly.

n Comparative graphs now display data from a ghosted parent correctly.

n Check Units now works correctly with the TREND builtin.

n User names for units are now accepted in equations in the equation panel.

n Converters that are cross-level ghosts of flows, now report correctly as flows.

n Restore All Devices no longer clears values in Numeric Displays.

n Fixed a problem where Restore All Devices did not restore Graphical Input Devices.

n Numeric Displays and Status Indicators now retain their values after saving and reopeninga model with restored graphs and tables.

n Message posters with navigation no longer displays an empty message box if text is notassigned.

n Chained sliders no longer displays the U button when conditions don't require it.

n The distribute button on a Chained Slider now works correctly.

n Documentation for variables associated with an interface object now display line feeds cor-rectly.

n Older models with equations that use the OR builtin now translate correctly if there are nospaces before the OR.

n Fixed a problem running a version 9 model in storytelling mode that caused the run resultsto include variables that were not yet unfurled.

n Older models that used !=, !, &, or | in equations now translate correctly.

n Corrected a problem where comments in the equations of version 9 model were beingtranslated as though they were part of the equation.

n Arrayed conveyors and ovens with Apply-to-All not enabled now translate transit timesand cook times correctly.

n Fixed a problem with arrayed entities controlled by an interface object that caused the dia-gram to draw slowly and be unresponsive.

n Other miscellaneous bug fixes.

The following defects were fixed in Version 10.0.2

1. Corrected a problem with non-negative stocks going negative when connected to a bi-flow with feedback.

2. Models containing sounds assigned to buttons now open properly.

3. Fixed a problem with data disappearing from graphs when adding another entity to thegraph.

4. Corrected a problem that caused changes to panel properties to get lost when saving orrunning a model without clicking on the diagram.

5. Modules saved in separate files now save correctly.

6. Importing a model with chained input devices now un-assigns the variables.

7. Models created in 9.1.4 or earlier that use equations in the parameters of the SUM builtinnow translate correctly.

8. Fixed a number of issues with message poster frequency.

9. Navigation buttons with the option to switch a variable on or off now work correctly.

10. Corrected a problem with the PULSE builtin when pulsing at certain fractional intervals.

The defects fixed in Version 10.0.1 are organized by the following functional categories:

General Fixes

Arrays

Builtin Functions

Data Import/Export

Discrete Objects

Graphs and Tables

Modules

Saving

General Fixes

1. Corrected a problem with additional delays moving material in a main chain with feedbackfrom outflows to inflows.

2. Corrected several problems copy and pasting entities.

3. High-level maps now correctly link to the model.

4. Typing a value into a slider now works properly.

5. Opening a model that contains an arrayed entity that has not been run will no longercrash.

6. Hover window no longer interferes with edits to entity names on the diagram.

7. Equations containing unary operators are now valid.

8. Corrected dialog display for Page Sequence options (Model Preferences dialog) and ButtonAppearance (Button dialog) on Mac computers.

9. Corrected a problem that caused the software to crash when using the Option/Alt key inanother application.

10. Corrected a problem that occurred on some Windows computers that caused the softwareto crash after right-clicking on an entity.

11. Graphical functions with high precision now draw correctly.

12. Corrected a number of issues associated with copying and pasting data into a graphicalfunction.

13. Disabling a graphical function assigned to a Graphical Input Device now automatically un-assigns the variable from the Graphical Input Device.

14. Corrected a problem where itmx and stmx files were being associated with older versions.

15. Fixed a problem in the Sector Specs dialog whereby Sector names were corrupted.

16. Push button switches now display properly.

17. Fixed a problem with models running slowly in story telling mode.

18. Corrected a problem editing variable names that contained carriage returns.

19. The Run Controller clock now displays the correct time when the model is paused.

20. Corrected a problem with rich text documentation appearing on the Equation layer ashtml.

21. An alert now appears on Mac computers when saving a model with a file name longer than31 characters.

22. Changing the non-negative state of a stock or uniflow/biflow option of a flow now worksproperly using the context menu.

23. Fixed a problem on Macintosh computers opening models with filenames containing UTF-8characters.

24. Corrected a problem on some Macintosh computers that caused a software crash whilequitting the application.

25. The Revert button on the Equation panel now works properly on Mac computers.

Arrays

1. Adding an element to a dimension with Apply to All unchecked no longer causes a crash

2. Using the Data Manager to loading data and parameters into non- Apply to All arrayedentities no longer causes the software to crash.

Builtin Functions

1. RAMP builtin now works with Runge-Kutta integration method.

2. LOOKUP builtin now accepts cross-level inputs as valid parameters.

3. Fixed a problem with the MAX and MIN builtins reporting incorrect results with parametersthat had negative values.

4. Fixed a problem with FORCST and TREND builtins not respecting the initial value.

5. If the <input> value for FORCST and TREND is 0, the software no longer returns a divisionby zero alert.

Data Import/Export

1. Corrected a problem on some Macintosh computers, where importing to a graphical func-tion did not import all data.

2. Importing data to an Apply to All arrayed variable is no longer restricted by the equationtext limit. When importing data to an Apply to All arrayed variable that uses the [ , , ,] syn-tax, the software will now automatically disable the Apply to All option and import thedata to individual array elements if the equation exceeds the text limit.

3. Fixed a problem with the scroll bar not functioning in the Manage Persistent Links dialog.

Discrete Objects

1. Changing a conveyor from discrete to continuous no longer causes the software to crash.

2. Multiple exponential leakages now initialize properly.

3. Variable transit times based on the conveyor values no longer result in a circular con-nection error.

4. Renaming a transit time variable no longer causes a crash.

Graphs and Tables

1. Automatic scaling on comparative graphs now updates properly.

2. Globally scaled variables in a graph can now be De-Set.

3. Dragging a variable inside a module from the Find palette to a graph or table now worksproperly.

4. Data no longer disappears from locked tables after opening the table dialog.

5. Table dialogs for tables with blank lines no longer causes the software to crash.

6. Corrected a problem with variables not saving in a table with the 'Use month names'option selected.

7. 'Hide detail' option is now enabled on locked tables.

Modules

1. Importing a model that contains a module with the same name now works properly.

2. Importing a model with an interface into a module no longer crashes when saving.

3. Models with multiple nested modules now save correctly.

4. Cross-level ghosts used in an equation now save correctly.

Saving

1. Saving a model file on a Mac computer with an .itm or .stm extension is no longer anoption.

2. Precision settings in scales and ranges now save correctly.

3. Print orientation now saves correctly.

4. Navigation buttons no longer save as menu buttons.

5. Navigation buttons that navigate from the interface to the model layer or between modulelevels now save properly.

6. The zoom level on navigation buttons are now being saved.

7. Locked models now remain locked after saving.

8. Graph annotations now save.

The following defects were fixed in Version 10:

1. Corrected a problem with oven COOKTIME being forced to ZERO when not cooking.COOKTIME now only changes when OSTATE becomes 1.

2. Fixed a problem where very small numbers were not truncating properly. Mathematicallyinsignificant numbers are now being truncated and returning a value equal to 0. Logicstatements comparing variables to 0 may need to be updated in version 10 to get thesame simulation results as in previous versions.

3. Data import/export to a CSV file no longer requires Microsoft Excel to be installed.

4. Fixed a problem with RUNCOUNT returning 1 instead of 0 for newly opened models.

5. Fixed a calculation problem with ARRAYSTDDEV.

6. Corrected an issue whereby exponential leakage with leakage fraction set to 0 gave erro-neous results.

Known IssuesThe following are known issues in Version 10.1:

1. Models saved in Version 10.1 may not work correctly if opened in previous versions.

2. Diagrams copied to the clipboard will paste as bitmaps. A workaround for this is to holddown the Shift key while doing the copy (either from the menu or via the Ctrl+C shortcut).When you do this vector graphics will be placed in the clipboard, but not model structure.On Windows use Paste As in the receiving application end select Enhanced Metafile toensure you get the best results.

3. Importing a model file into a module requires the file to be in a Version 10 format. If youwant to import a model that was saved in a previous version, open and save the model inVersion 10 before importing it.

4. When renaming a module that has the 'Save in separate file' option enabled, the modulefile is renamed regardless of whether you save your changes or not.

5. Play Movie buttons on Macintosh computers do not display the video.

6. Conveyors that do not have an outflow no longer accept inflowing material and will showdifferent model behavior than in previous versions.

7. If you disconnect an outflow from a conveyor with leakage the first leakage is not changedto be the outflow. Disconnect and reconnect all leakages or save and reopen the modelafter disconnected the outflow to work around this.

8. On Windows machines, if you do not have Quicktime installed, an error message mayappear indicating the program cannot start because QTCF.dll is missing. Click OK and thesoftware should start without a problem. Quicktime is only required if the models you arerunning use Quicktime files.

9. You may experience issues with model layer paging if the page size of your printer differsfrom the one the model was saved on. To correct this problem, go to Page Setup andselect a printer with the same page size.

10. Copy and pasting data does not support non-English numeric formats. Use the dataimport/export feature to copy data in non-English numeric formats.

11. If you are exporting a comparative table and stop a run, the Excel worksheet will onlyshow values for prior runs up to the point where you stopped the current run.

12. When exporting data, if DT is a repeating decimal in base-2 (such as 0.10 or 0.20), thereported values for TIME will drift from their true values (in particular, they will becomedecimal values).

13. Data will not import if variables names contain a percent (%) sign.

14. Importing JPGs, GIFs and BMPs require that the image and the monitor be set to 32-bitcolor.

15. When using the "Run selected modules option", assigned inputs that are not in a runningmodule will not have values even if their corresponding outputs are in a running module.

16. On Windows machines with dual display monitors, the right-click context menu will notappear on the secondary display if it is positioned to the left of the primary display.

17. Animation may significantly impact performance when using arrays. For medium and largemodels with arrays, we recommend turning animation OFF.

18. Importing a module with the same dimension name as another array in the model but dif-fering elements, will cause the equations that use that dimension to be reset if the "Applyto All" option is not enabled.

System RequirementsSTELLA and iThink are available in both Windows and Macintosh versions.

The following are minimum system requirements for version 10.

Windows

Microsoft Windows XP/Vista/7/8

256 MB RAM

200 MB hard disk space

QuickTime

Macintosh

Intel-based Mac

Mac OS 10.6 or higher

256 MB RAM

200 MB hard disk space

QuickTime

Technical Supportisee systems provides technical support via phone, fax or email to customers who have a cur-rent Technical Support Plan.

To contact a Technical Support Representative:

Email: support@iseesystems.com

Phone: (603) 448-4990

Toll Free: (800) 987-6758

Fax: (603) 448-4992