In a critical study of some recent action theory Professor James Tomberlin [7] makes some insightful and suggestive remarks concerning the by now well known problem of "Smith and the airplane" formulated by Keith Lehrer and Richard Taylor [3]. While these remarks do significantly advance our knowledge of the nature of the problem, I would like to try to show why the strategy they indicate does not lead to a solution that represents any improvement on the one developed in [1], [8] and [2].
The problem of Smith and the airplane is posed by the following apparent inconsistency. Suppose it is now shortly before 3:30 and Smith is at a country airport. The 3:30 plane is the only possible means whereby Smith can arrive at the city at 4:00. There is nothing to prevent Smith from leaving on the 3:30 plane, but he in fact does not do so: Then each of the following statements are true.
