What is the difference?

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ShouldBeImplemented

I am ShouldBeImplemented, an exception signaled when some method should have been implemented but was not.

This is more like a placeholder during development.

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NotYetImplemented

I am NotYetImplement, an exception signaled when a method is a stub for code that will be implemented in the future.

This is used in incremental development, for example when doing Test First development.

It is similar to ShouldBeImplemented, with a slightly different meaning.

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There seem to be some slight semantic difference but I'm failing to see it.

I can even say "The method should be implemented, but is not yet implemented." It's saying the same thing with different words.

Thanks,

Peter