Thanks for your hints, Andrea.
The problem in constructing a questionnaire/feedback is attributing values to each answer.... I have to think over to ponder them.
I could also reduce the 44 questions of Felder&solomon to just 4, like:
1. Are you more active or reflective learner (adding a short description for each)? Choose (drop-down menu active/reflective) and add a value (drop-down menu with all the values from -11to +11).
....and so on for the other 3 dimensions...
The problem is that the questionnaire/feedback activity would give me the total result of the 4 questions, for example 33 which wouldn't tell me anything about the learner's learning style.
I'm stuck!! Help!