  Leaving genetic stochasticity aside, do the other three categories provide a good classification of stochasticity, or is the classification more like that of animals in Borges' notorious Chinese  encyclopedia?[26]  For any classification to be a good one, it must, at the very least satisfy three criteria: (i) it must organize phenomena into a relevantly homogeneous class of categories. Relevance is determined contextually by the possibility of there being a coherent account of how those categories came to be defined. Including genetic stochasticity in the classification leads to a lack of such coherence—hence, its exclusion above; (ii) the categories should be jointly exhaustive, able to subsume all cases of the relevant phenomena; and (iii) the categories should be mutually exclusive, that is, no phenomenon should be subsumed under more than one category.