The Observational Medical Dataset Simulator (OSIM) Generation 1 is an open-source software application, written in R, that allows users to create simulated datasets that conform to the OMOP Common Data Model.  The simulation creates hypothetical persons with fictitious drug exposure and condition occurrence, with known characteristics that represent the types of scenarios expected in real observational sources.  The procedure is being used to create simulated datasets to support OMOP's central methods development activities, as well as to facilitate the OMOP Cup methods competition.  OMOP hopes OSIM will provide the broader research community a valuable tool to support the implementation and evaluation of alternative approaches for observational analyses.  

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