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The objective of this project was to continue to revise the Comprehensive Air Quality Model with extensions (CAMx) so that multiple computer processors can be used to increase the speed of model simulations that involve Probing Tools. The multi-processor capability implemented in this revision uses the Message Passing Interface (MPI) protocol that allows multiple networked computers to share the load in integrating the model solution. Past support by the Midwest Ozone Group (MOG) and the U.S. Environmental Protection Agency (EPA) allowed us to incorporate multi-processing into the core model. This work sponsored by the CRC extended multi-processing to the source apportionment (SA) and decoupled direct method (DDM) components of the model. The work was arranged according to the following three tasks: (1) initial MPI implementation in the Probing Tools; (2) MPI refinements and optimization; and (3) guidance and documentation. The product of this task is this final report and the delivery of the next generation of the CAMx/MPI beta version.