STELLA (or iThink), “the tool of general-purpose simulation and the thought support which utilize system dynamics” is. The model which was drawn up it does simulation with computer and it analyzes the change with the lapse of time by the fact that “system dynamics”, the system which changes attendant upon the lapse of time (the dynamic system) it expresses makes the hypothetical actual model in the computer, as the numerical formula model and, it is one of technique in order to keep overtaking the improvement step and solution in order to cope with actual problem.

As example of the dynamic system, change of the city population with the flow entrance and exit of population and destruction etc of the ozone layer with the discharge of freon it is lifted.

Product summary STELLA/iThink is “the tool of general-purpose simulation and the thought support which utilize system dynamics”. The model which was drawn up it does simulation with computer and it analyzes the change with the lapse of time by the fact that “system dynamics”, the system which changes attendant upon the lapse of time (the dynamic system) it expresses makes the hypothetical actual model in the computer, as the numerical formula model and, it is one of technique in order to keep overtaking the improvement step and solution in order to cope with actual problem. As for the difference of STELLA and iThink? The sample model which bundled is done just is different, as for the program itself is same ones in the software. In STELLA the model “for education”, the model “for business” bundled it is done to iThink as a sample.