isn't indicating the direction of a relationship (which you of course need to ascribe some meaning) more useful than non directional? But I agree, the meaning of an arrow while it can be informal at times, needs to be shared amongst the participants. For flow contrl / state machines, I use arrows to mean "from this state, you can get to this state", and then potentially annotate the arrow with a condition that would cause that transition.
Were you referring to the * ... 1 annotations you can use in class diagrams?
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isn't indicating the direction of a relationship (which you of course need to ascribe some meaning) more useful than non directional? But I agree, the meaning of an arrow while it can be informal at times, needs to be shared amongst the participants. For flow contrl / state machines, I use arrows to mean "from this state, you can get to this state", and then potentially annotate the arrow with a condition that would cause that transition.
Were you referring to the * ... 1 annotations you can use in class diagrams?