In the doc there's a page for Assessment that says this :

Question types being assessed

Array (Flexible labels) dual scale
Array (Flexible labels)
Array (Flexible labels) by column
List (Flexible labels) (Dropdown)
List (Flexible labels) (Radio)
List (Dropdown)
List (Radio)
List with comment
Multiple options
Multiple options with comments

But actually very few of them can be used. For instance, it does not work with "Multiple options".

I looked into advanced settings for a multiple options questions and I saw a value that can be assigned. But usually there are true answers and false answers...

Any clue on how make it work ? Or when will it work ?

Regards

There are bug reporting for assesment:
bugs.limesurvey.org/view.php?id=4585
bugs.limesurvey.org/view.php?id=4612

Due to the changes at label sets and sub-question, assessments at muleiple option questions don't work very well. We are thinking of implementing the previous functionality to these question types for 1.91, but it's very complicated.
Switch to 1.87 if you need these questions types for assessments.