Functional Block Diagrams are introduced as a graphical representation of the functional relationships among parts of a system. A functional block diagram provides the overall output (or outmost consequence) of a system as a joint event This joint event is decomposed into simpler events the outcome space of which is partitioned into subsets corresponding to the outcomes of the initial joint event. The simpler events can be further decomposed into a lower level of events where always the outcome space of the children events is partitioned according to the possible outcomes of the parent-event. A hierarchy of events is thus...