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copied!<p>I think you are on the right track. The <strong>"model" is vague</strong> in a lot of cases <strong>because it is different things to other people</strong>, and rightly so.</p> <p>For <em>me</em>, my business <strong>objects that come back from my WCF service I consider my model</strong>. Because of this <strong>my projects don't have that pretty file structure with the holy trinity of namespaces:</strong> *.Models, *.ViewModels, and *.Views. I personally <strong>consider objects coming back from business logic</strong> or anything of that nature <strong>the "model"</strong>. </p> <p>Some <strong>people tend to lump both the business objects and the business logic together</strong> and call that the "Model", but <strong>I find that a little confusing</strong> because I picture a Model to be sort of more static than I do business logic, but <strong>it's semantics</strong>.</p> <p>So when you look at examples of MVVM projects and don't see anything very clearly "Model", it's just because folks treat them differently. Unless an application is very standalone, <strong>I would actually be very suspicious of an application with an actual *.Model namespace</strong>, to be honest.</p> <p>The other thing that is great here is that many times you already have an investment in these types of business objects and I think a lot of people see "MVVM" and immediately assume they need to start defining the "M", even though what they already have is perfectly fine.</p> <p>The confusion between a Model and a ViewModel is pretty common, too. Essentially <strong>I know I need a ViewModel if I need a combination of data and behavior</strong>. For example, I wouldn't expect INotifyPropertyChanged to be implemented on a Model, but I would a ViewModel.</p>

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