Variable stage

A variable stage planet is one that is undergoing the terraforming process though has the chance of failing. Its counterpart is a perfect stage planet, one that cannot fail the terraforming process. Variable stage worlds require considerable time to alter, sometimes centuries, and come with various factors that can hinder the process. One example is Venus, where the constant volcanic activity made it difficult to stabilize the atmosphere. Once the planet's rotation was slowed and magnetic fields strengthened, the volcanoes ceased to constantly erupt, allowing the terraforming to proceed.