That's a good starting point. I'd drill down even further and ask "what does the user do with the application?" If the user needs to look at multiple screens a

That's a good starting point. I'd drill down even further and ask "what does the user do with the application?" If the user needs to look at multiple screens at a time (e.g. like a mail client or something of similar complexity), then they're a candidate for an SPA. If the user does not need to do that, the app is probably simple enough to not be an SPA.