Simulationism, also known as modelism, is an ideological movement and school of micro-patriology pointing a convergence between micronationalism and the hobby of simulating countries. Therefore, inside modelist thinking, there is a clear line that separates micronational activity and "macronational" business.

The majority of simulationist oriented projects adopts macro-territorial references just for the purpose of building a fictitious cultural element, without any real secessionist or statehood intention.

Many of them also incorporate historical factoids or "sagas", without actual correspondence to reality.

Within Peter Rasmussen´s scale of seriousness, "simulation" micronations are considered more serious than "just for fun" ones, but less serious than "nationhood".