Rapidity distributions for two particle inclusive reactions are calculated from the Nova model which has been successful at reproducing the single particle distributions. Particular attention is given to the 2Π correlations in Π P and pp collisions for which data are available. Good agreement with data provides further evidence for a strong clustering of secondary’s in particle production at present machine energies, a feature inferred previously from the analysis of single particle distributions. We stress the importance of measuring the energy dependence of , the quantity which normalizes the two particle distribution. A number of other features of correla tion experiments are discussed. General properties of particle production are emphasized in reviewing the Nova model.
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