Now that the problem of planning in has been expressed using Formulation 10.1, the methods of Section 10.2 directly apply. The main limitation of their use is that the new state space is exponentially larger than . If contains states, then contains states. Thus, even though some methods in Section 10.2 can solve problems in practice that involve a million states, this would only be about states in the original state space. Handling substantially larger problems requires developing application-specific methods that exploit some special structure of the I-space, possibly by defining an I-map that leads to a smaller derived I-space.