Here is an example for the technical possibilities of questionnaire controlling:

Questions 1 - 5 to all interviewees.

Questions 3 and 4 are supplied at random.

Every third interviewee gets statements from
question 6 to 11,
question 12 to 17 or
question 18 to 23,
where only four randomly picked statements are being evaluated.

If question 2 is answered with "no", four items of the questions 12 to 17 will be supplied in any case.

Question 24 shows four different product-labels, the interviewee ticks the one that appeals most.

Question 25 shows four different product-labels, the interviewee decides which appeals most.

Question 25 shows the remaining product-labels, the interviewee decides which appeals least.

Question 26 asks for the place of residence/postcode. If the interviewee lives in Berlin or Potsdam the possible districts to the named postcode appears on screen for selection.

The findings of the given data (district code, population, distance) are save internally.