[zak_mc_kracken]

We've known this since at least 1994, when the GoF book [1] famously said:

"Favor object composition over class inheritance"

[1] http://www.amazon.com/Design-Patterns-Elements-Reusable-Obje...

[drumdance]

Ha, that's one of the few things I remember from that book. (Not knocking the book, just my poor memory.) I remember it being a big "a ha!" for a project I was working on.