Hi
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Because AngularJS is an MVC framework, my answer would be that the controllers use the models. Are there 2 distinct models for Actrl and Bctrl?
If so and your app will grow in the future than perhaps seperating them out would be the best thing. As far as a global controller is concerned
I wouldn't know (I'm too inexperienced) but it probably wouldn't hurt to have it. There doesn't seem to me to be any negatives to it, only a potential benefit in the future!
Ciao
Dale