The VAA doesn't give the voter Alice any information about whether the politician held the promises they made 4 years ago. At least I'm not aware of a VAA that does this.
No, but that's in effect what I'm suggesting the VAA's should do in my previous comment.
It's true that it is not always trivial to judge whether or not a politician has held his/her promise. Of course, the more exact the promises are written, the easier it becomes, but there will always be room for interpretation. (This we know from the legal sphere, in particular.)
You could set up a court-like system where respected judges decided whether promises had been violated or not. (In principle, this could even be determined in real courts.) It's true that some people probably would think that such a court is biased, but if it's broadly accepted by the middle range of the voters (which effectively decide the elections anyway), that would be sufficient.
Just a few things added to what I said already:
A thought experiment. You have two politicians.
One is Mr. Smith and the other is Mr. Cook. Mr.Smith is from the Blue mainstream party that you prefer and that party has mostly the right positions in their party program. But you also know that Mr. Smith has a low IQ, is corrupt and generally doesn't care about the promises he made last month.
On the other hand Mr.Cook is from the Green mainstream party that you don't like. On the other hand you know that Mr. Cook has a high IQ, is incorruptible, values holding...
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