Good day, dear colleagues!

Can anybody answer me if it is possible with LimeSurvey? I need to make a survey with very long and boring questionnaire. It contains 120 questions. We have an idea to show some not important questions selectively - for instance, the first question should be shown 50% of respondents or every second respondent, bet the second question - 20% of respondents or every fifth respondent, etc. Respondents should be selected randomly and without any conditions or answers to previous questions. Does anybody know, is it possible to define condition to each question or question group, that this question / question group must be shown not all respondents but only half of respondents, or have any ideas else how to realize this idea?

Thank you!
Andrew

You can use Expression Manager to load an equation type question with a random number and then base relevance on that.

Dear Tpartner, thank you for the answer, is it possible to get any examples of equations? I haven't worked with Expression Manager earlier.

Dear all
I have founded some good examples on my topic here here - www.limesurvey.org/manual/Expression_Manager_Sample_Surveys (Randomization Groups).
It was very useful for me, thank to the author.