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copied!<p>First of all, about this phrase: "a pretty good approach to app architecture is...": I don't believe there is a single good approach to all apps, and I would prefer always to use the simplest approach (i.e. fewer layers) that could solve your problem at hand. </p> <p>When you say "Service", it appears to be a whole layer of web services, rather than just some domain service classes; in most cases I've seen with Asp.Net MVC, the controller itself can fulfill the role of a service, thus eliminating the need to add yet another layer. Of course there are exceptions, just be sure your reason to increase complexity is legitimate.</p> <p>About DTO's and View models: DTO's, like you described, flatten the object model and return "only data that I need". DTO is a more generic term, usually used with web services where you don't know who is the consumer. Think of (Asp.Net MVC) View Models as a more specialized kind of DTO, that returns "only data that <em>THE VIEW</em> needs". Thus, if you don't need an extra layer of services, you also don't need an extra layer of DTO's, just use View Models to flatten the domain classes directly and return them from your controllers. </p> <p>In fact, for very simple applications, even the separation of Models x ViewModels is overkill - it is possible to use a single Model layer to fulfill both roles, with the help of the ViewBag. I don't know your requirements, so I can't say which is better for you.</p> <p>Finally, one comment: if you must build a single page application, Asp.Net MVC is not the best tool for the job. I'd recommend using Asp.Net Web Api (only services, no views) at the server and a <strong>client</strong> mvc framework, such as BackboneJs or AngularJs.</p>

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