We discuss quantum trajectories from the point of view of Bohm and Wyatt. We find that the theory can be formally written in terms of a field (probability) [P(x,t)], a position [x], and an average momentum [ ] in a density operator which is normalized and Hermitian, but not positive definite. One consequence of this is that the theory obeys, in a natural way, a formal relation DeltaxDeltap=0 for these averages. We interpret this as a consistency requirement for a trajectory in space-time with a position x and an average momentum which allows a space-time description. We show that a momentum space form can be written in terms of a field (probability) [P(p,t)], a momentum [p], and an average position []. We briefly discuss potential chemical applications of quantum trajectories in the theory of chemical dynamics, kinetics, and local field theory.