An action is understood by us iff we see the action as being the conclusion of an appropriate practical syllogism. With this starting point of von Wright's Explanation and Understanding (1971) several other proposals are compared and more or less identified with, namely understanding as (i) knowing of the intention with which the action was done, as (ii) knowing the reasons for which it is or was rational to perform the action, and as (iii) knowing the subjective meaning of the action. Relative to these different versions of "understanding of an action", I summarise some differences between von Wright and myself