The Aggregate Level Simulation Protocol (ALSP) is a protocol and supporting software that enables simulations to interoperate with one another.

David Seidel, March 1993, "Aggregate Level Simulation Protocol (ALSP) Program Status and History", The MITRE Corporation.

Richard Weatherly, David Seidel, and Jon Weissman, July 1991, "Aggregate Level Simulation Protocol", The MITRE Corporation.

Annette Wilson and Richard Weatherly, December 1994, "The Aggregate Level Simulation Protocol: An Evolving System", The MITRE Corporation.

HLA was produced by the merger of the DIS protocol with the Aggregate Level Simulation Protocol (ALSP) designed by MITRE.

The Aggregate Level Simulation Protocol (ALSP) extended the benefits of distributed simulation to the force-level training community so that different aggregate-level simulations could cooperate to provide theater-level experiences for battle-staff training.

Mary C. Fischer, April 1994, Aggregate Level Simulation Protocol (ALSP) - Managing Confederation Development, U. S. Army Simulation, Training and Instrumentation Command.

Mary C. Fischer, October 1995, "Joint Simulated Battlefield Through Aggregate Level Simulation Protocol', U. S. Army Simulation, Training, and Instrumentation Command, published in Proceedings of the Southeastern Simulation Conference '95, Orlando, FL.

Gordon Miller and Anita Zabek, March 1996, "The Joint Training Confederation and the Aggregate Level Simulation Protocol", The MITRE Corporation, published in the June 1996 edition of Phalanx, a MORS publication.

Laura Feinerman, Gordon Miller, David Prochnow, Richard Weatherly, Annette Wilson, and Anita Adams Zabek, "Aggregate Level Simulation Protocol (ALSP) Project 1994 Annual Report", dated March 1995, The MITRE Corporation.