Shoud we allow beeing able to launch several models at the same time in Cormas for Pharo?

[nbecu]

In VW we choose to have the CormasModel class has a singleton because:

• we wanted to be able to call the instance of the current model from anywhere in the code, by using: CormasModel currrent
• having a single model open in an image was making things much more simple for implementing the distributed version of CORMAS.

Now that we switch to Pharo, - and that for the moment a distributed version on pharo is not the priority - we can ask ourselves, should we keep CormasModel as a singleton or should we allow several model to be lauched in a same image The floor is yours. What are your arguments in favor or one or the other option?

[SergeStinckwich]

I think first, we should implement a real singleton, because at the moment we duplicate code at instance and class side.