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Clemens Vasters: Loose coupling is indeed a Good Thing for 1:1 and, in a bit more limited fashion, for 1:N communication environments; in N:M way environments, the lack of tight rules is a call for chaos. Looks like we are farther apart than I would have thought. I would have said that tight coupling is indeed a Good Thing for 1:1 and, in a bit more limited fashion, for 1:N communication environments; in N:M way environments, getting complete agreement on a set of tight rules is practically impossible.
For an excellent, informative, readable, and highly entertaining view on this subject, read Clay Shirky's In Praise of Evolvable Systems.