System Dynamics Calculator

The SD Model in Depth

TELE-WORX Making Communications Work...

The model has the following basic file structure:

•METEDATA - the minimum metadata to accomplish ownership, version control, security, traceability, and searchability
•PREFERENCES - a set of settings that affects appearance, abstraction and other model-specific qualities
•LAYER LIST - the primary model registered name and a list of layer registered names
•SIMULATION LIST - the list of named simulation scenarios
•COMPONENT LIST - the unique set of registered names of model components and fragments contained in the model

The model has the following minimum metadata:

•MODEL NAME STRING - the plain language name of the model
•MODEL NAME REG - the label assigned to the model by the Model Builder
•MODEL MODE - a value of “INTERVAL” for a unitless model or “DATETIME” for a calendar / clock-based model
•MODEL OWNER - the Model Builder user who defined the model
•MODEL VERSION NUMBER - the model base reference version number
•MODEL VERSION OWNER - the modeler information such as organization name and model URL
•MODEL VERSION DATE - the published date
•MODEL REVISION NUMBER - an appended model revision number
•MODEL REVISION OWNER - the user who last revised the model revision
•MODEL REVISION DATE - the date of model version changes
•MODEL COMPLIANCE - the version of the global system dynamics modeling standard followed by the Model Builder process used to build the model
•LOCK MODEL - a value of “NO” (default) or “YES” to prevent Model Builder changes to any element of the model by a user who is not the model owner, model version owner, model revision owner or authorized by a password
•LOCK PRIMARY LAYER - a value of “NO” (default) or “YES” to prevent Model Builder changes to any element of the model by a user who is not the model owner, model version owner, model revision owner or authorized by a password
•MODEL DESCRIPTION - an abstract of the model’s scope and use – a “Read Me”

The model’s metadata shall be compliant with StratML, an XML-like mark-up language that is searchable and allows the model to be registered in StratML-compliant model “warehouses”.

The following Model Definition Base attributes are defined in the Model Builder process for each model component or fragment in the model:

•COMP NAME STRING - the component’s or fragment’s user assigned plain language label
•COMP NAME REG - the label assigned to the component or fragment by the Model Builder
•COMP TYPE - the component type or subtype or fragment
•COMP LOCATION - the coordinates or “placement” of the component or fragment in the model image
•LABEL COMP - label the component with the NAME STRING; a value of “NO” or “YES” (default)
•COMP INTERFACE LIST - the names of the interfaces or “ports” that this model component is equipped with; the standard names can be overridden by the user with a new user-assigned plain language COMP INTERFACE NAME STRING
•LABEL COMP INTERFACES - label each component interface with the COMP INTERFACE NAME STRING; a value of “NO” (default) or “YES”
•COMP CONNECTION LIST - the mapping from each COMP INTERFACE NAME STRING to COMP NAME REG / COMP INTERFACE NAME STRING on another model component in the model
•NOTE - simple text generated by the user and placed anywhere to explain things
•NOTE LOCATION - the coordinates or “placement” of the note in the model image