This paper captures high-level design imperatives and solutions used to expand a two-sided model to an n-sided model to premiere interactive, multi-sided, coalition-warfare simulations. We focus on general considerations with impact beyond the bounds of a specific model. The designs discussed are incorporated in version 1.85 of the Joint Theater Level Simulation (JTLS) and are being tested with a ten-sided Southwest Asia scenario. This U.S. Department of Defense model now supports a database-defined number of sides ranging from two to ten. Each side maintains an independent intelligence perception of the theater of operations and a designation of its friends, its enemies, and any neutrals. Multiple sides can align in "grand coalitions" or segregate into flexible groups to engage in multi-sided conflict. All sides are split into a variable number of dynamic factions. Each faction has specific attributes profiled by its Battlefield Operating Systems. Each faction holds a unique set of units and targets. And, they can subdivide, merge, or transfer to another side.
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