Which are MVVM pattern features and extensions?

Which开发者_JAVA技巧 are MVVM pattern features and extensions? As I have noticed there are many MVVM frameworks out there, and all share the same concept, even though there are some differences. I won’t ask what the differences are, however I would like to create a general list of key features/extensions for MVVM pattern that will provide a good starting point when choosing between different frameworks or own created MVVM pattern . Please explain the feature you are mentioning. For making the question clear I’ll start with my own knowledge. I’ll complete the list as I get answers.

Patterns

• ObservableCollection
• INotifyPropertyChanged
• ICommand
• Mediator
• Behaviours(System.Windows.Interactivity)

Structure

• Model
• ViewModel
• ModelView

Behaviours(System.Windows.Interactivity) are very usefull when coding mvvm. there are a lot out there.