In MVVM should the ViewModel or Model implement INotifyPropertyChanged?

Posted by Edward Tanguay on Stack Overflow See other posts from Stack Overflow or by Edward Tanguay
Published on 2009-04-21T11:57:00Z Indexed on 2010/05/10 16:54 UTC
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Most MVVM examples I have worked through have had the Model implement INotifyPropertyChanged, but in Josh Smith's CommandSink example the ViewModel implements INotifyPropertyChanged.

I'm still cognitively putting together the MVVM concepts, so I don't know if:

you have to put the INotifyPropertyChanged in the ViewModel to get CommandSink to work
this is just an aberration of the norm and it doesn't really matter
you should always have the Model implement INotifyPropertyChanged and this is just a mistake which would be corrected if this were developed from a code example to an application

What have been others' experiences on MVVM projects you have worked on?

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