Questionnaire (plugin)

Hi Björn,

1.- The official Moodle documentation doesn't display an additional column left to the matrix (see first image in my first message). The actual working version has this additional column with pre-selected radio buttons. Why?

You are right, the screen shot illustrating that matrix question is outdated. The additional column with pre-selected radio buttons was added in a later version, to make it clear which radio buttons should have been checked in the matrix.

2.- As the question is set to "response required = no", I would expect to be able to answer some items and not answer other items.

Actually, the option "response required = no/yes" applies to the whole question, not to the individual responses/radio buttons.

3.- But as soon as one item is answered, all other items have to be answered, too.
This is a behavior I find irritating to both author and users. Is this the intended behavior or is it due to some (mis-)configuration?

What you need here is to select the N/A columns option for your question, as explained in the doc:

3.9.4 Type of rate scale
Normal (default value)
N/A columns  : Choose this if you want an N/A column to be added to the right of your Rate scale items columns.

See the attached screenshot. I hope this answers your query.