The software used for the creation of a simulation. Complicated and fairly difficult to use. People who are used to having the knowledge, skills, especially to create a simulation.
The software used for modeling situations. Are complex and difficult to use, so those will be available with the skills, knowledge, especially in order to build a model situation.
The software is used for modeling the situation. Complicated and difficult to use. So, who to work must have the skills, knowledge, especially to build simulation model.