Branson's North Carolina Business Directory for 1869 shows that Shelby, in the years immediately following the Civil War, had changed little from the rural county seat economy that it had been throughout the ante-bellum period.
Enterprise Architect provides a platform for the system engineer using the Systems Modeling Language (SysML) and model based development, and in addition to the engineering models the tool provides support for project and process management.
Core Software is used to build and simulate system dynamics models. The majority of published work in the field has been done using these tools. Extensive Software is used to build and simulate models that may contain some system dynamics formulations but also other modeling forms and diagrammatic representations. Web based tools are used to engage people in web activities related either to existing model execution or model development.