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The ACCUM statement is short for "accumulate." Its use is slightly different than the GROUP and LOAD statements. ACCUM does not "batch together" entities, but rather holds entities at a location until a certain number accumulate. It behaves much like a gate restricting entities until a certain number arrive at the location. After the required number accumulate, ProModel releases them for downstream processing. This allows you to model a certain type of batching which involves simply the accumulation of parts and their subsequent release—all at a single location.
When using the ACCUM statement, make sure the capacity of the location where you are using the ACCUM statement is at least as large as the amount accumulating.