Any continuous variable (i.e. continuous node) may be discretized, a process in which a set of numeric borders is used to partition the range of the variable into intervals called states, so that each state corresponds to a range of values. The numeric values that divide adjacent states are known as thresholds, so the range of a state is from its lower threshold to its upper threshold, with the upper threshold being the same as the lower threshold of the next state. If reference is made to a state's threshold without specifying lower or upper, then lower is implied. Only continuous nodes can be discretized, but numbers may also be attached to the states of any discrete node, in which case each state has a single number known as its state number. See also state index.

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