Models stepping on each other?

[eluser]tomdelonge[/eluser]
That's not quite what singleton is. In any case, each model is instantiated as a separate object. In every request, everything is new. The models treat everything with customer a and customer b the same. If they need something treated differently, then you have to use sessions or something to store the extra data. What you're suggesting, like noctrum said, is not really a problem.