 It was soon realised that evolutionary game theory itself had problems structurally similar to that of the equilibrium selection problem. Several competing definitions of evolutionary stability were put forward, each of which had certain intuitive merit. In addition, as the connection between the static and dynamic approaches to evolutionary game theory were explored in detail, it was found that there was, at best, an imperfect fit between static concepts of evolutionary stability and that of dynamic stability. Furthermore, dynamical models of evolutionary game theory led to outcomes which were expressely irrational from the point of view of traditional game theory, such as the preservation of strictly dominated strategies.