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Four algorithms are considered which can be used to schedule events in a general purpose discrete simulation system. Two of the algorithms are new, one is based on an end-order tree structure for event notices, and another uses an indexed linear list. The algorithms are tested with a set of typical stochastic scheduling distributions especially chosen to show the advantages and limitations of the algorithms. The end-order tree algorithm is shown to he an advantageous, immediate replacement for the algorithm in use with current simulation languages. The most promising algorithm uses the indexed list concept. It will require an adaptive routine before it can be employed in general purpose simulators, but its performance is such that further study would be fruitful.

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