We present a reasoning about actions framework based on a sum of epistemic logic S5 and propositional dynamic logic PDL together with a `no forgetting' principle, also called perfect recall. We show that in our framework an action may be decomposed into a purely ontic action followed by a purely epistemic action. We also show that the latter is completely definable in terms of simple observations, i.e., `test that' actions and that they are equivalent to public announcements of public announcement logic PAL as studied by Plaza, van Benthem and others. Finally, since these actions respect `no learning' principle we show that a unified reduction method based on regression, as studied by Reiter, applies.