Practical Implications
From the point of view of the voter CPO-STV is no more complicated than traditional forms of STV. Under both systems the ballot paper is the same and voting occurs by ranking the candidates in order of preference.
However, with respect to calculating an election result, CPO-STV is significantly more complex. A hand count, therefore, is only likely to be feasible in simple elections with a small number of candidates and voters. For large scale elections it is necessary for the results to be calculated by computer.
Finding the result of a CPO-STV election involves producing results, one at a time, for every possible pair of every possible set of winning candidates. It is therefore a task that increases dramatically in difficulty as the number of candidates does. There are, however, certain shortcuts that can be taken that will reduce the length of a count while producing the same result. We have already seen, for example, that where a candidate has at least a quota of first preferences it is not necessary to consider any outcome in which they are not present as a winner.
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