An attack described in a "node" may require one or more of many attacks described in "child nodes" to be satisfied. Our above condition shows only "OR conditions"; however, an "AND condition" can be created, for example, by assuming an electronic alarm which must be disabled if and only if the cable will be cut. Rather than making this task a "child node" of cutting the lock, both tasks can simply reach a summing junction. Thus the path (("Disable Alarm", "Cut Cable"), "Steal Computer") is created.