Incredible. Your answer are always very valuable.

Little comment. You said:

"He creates a class "ConfigurationOfMyDatabaseDriver" since he learned that Metacello uses a simple class with methods to describe the load order
and version of the packages that fit together."

Maybe I am wrong, but I think that you SHOULDN'T be aware of the order. I mean, you should be able to write all the spec package:���
in ANY order and that should still work perfectly. The order is not defined by the order of the spec package:� but using the required.

Of course, maybe there are exceptions, but most of the time, the order should be determined by the dependencies (requires:) and not by the natural order of the invocations to spec package:
�
Thanks again for this wonderful answer. I will incorporate most of that in the Metacello chapter. Can I ?

Cheers

Mariano