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copied!<p>You want to separate all of your business logic, and data validation into the model. Usually that includes "grouping" datasets and such or filtering data by some criteria.</p> <p>You want to separate all calls to these methods of the model in the controller, who's responsibility is to retrieve and send data to and from the model. The controller then passes the applicable data set into the view.</p> <p>The Helpers are logic that is used by the view to do <em>presentation</em> logic (not business logic or validation) such as printing menus and such.</p> <p>The View is where you will use the Helpers (or not, they are not required to use MVC properly but they do "help" :p) to write HTML, CSS and JS to the browser. You may also separate commonly used view modules into partial views that you can include on more then one view.</p> <p>You can further seperate things into a ViewModel, but then you are going outside of "strict" MVC. In this case, you would use the ViewModel to help the view interact with the model - basically the ViewModel is a modular controller. In this case, the controller would do much less then what little it does already. </p> <p>However, this is generally overkill for web applications. Because web apps have a single flow of execution (the request) separating things into a ViewModel becomes unnecessary. However, in GUI code, the ViewModel becomes much more useful (as GUIs have much more then a single flow of execution).</p> <p>You always want to separate business logic into the Model, period. Remember that you should not couple your controller to your model - so that you can use your model elsewhere in other controllers or even expose it as a web service.</p> <p>Hope this helps :)</p>

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