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This is the second post in a series on Cairngorm fundamentals. We will be covering the concept of the ModelLocator, the Model in MVC. In short, the ModelLocator is a Singleton which implements a marker interface (no method definitions) from the Cairngorm framework called com.adobe.cairngorm.model.IModelLocator. The ModelLocator class defines properties that hold all application data. From now on we’ll just call this class the Model.