This interaction consists partly of linear "cause and effect" relationships (the relationships that are normally "designed") and partly from "non-linear", complex, even unpredictable relationships (the good or bad relationships that are often unexpected). Whether designed or not, both types of interaction occur when socio and technical elements are put to work. The corollary of this, and the second of the two main principles, is that optimization of each aspect alone (socio or technical) tends to increase not only the quantity of unpredictable, "un-designed" relationships, but those relationships that are injurious to the system's performance.