Hello!

I hope this isn't a stupid question, but I'm still new to LimeSurvey and didn't find a solution so far.

A client of mine would like to give the participants an immediately summary of the survey after they have answered all the questions.

Is this possible?
And if so, how?

Thanks in advance, all the best
Lucas

Yes, of course.
You may display the results on the "End message screen".

Use the Expression Manager (in 4.x. expression script) to calculate and display everything you'd like.
Study the sample surveys
manual.limesurvey.org/Expression_Manager_sample_surveys
The first one "Relevance, Tayloring and Equations" with the BMI example show you how to do it.

Joffm