Questionnaires have been invented by Sir Francis Galton (1822 - 1911) and have not changed much since. Even online questionnaires still look and feel like their paper and pen counterparts.

The data generated in this way is:

• Costly: (Initial) response rates of paper and web questionnaires can be very low, so you need to chase the participants to complete the questionnaire. If you use paper questionnaires, you also need to transform the paper data into digital facts.

• Based on inaccurate memories: Because a questionnaire is costly and cumbersome to fill in, participants only fill in a questionnaire once. This leads to questions such as “How many minutes did you watch tv last week?” or "When did the pain go away after the operation? 1 week, 2 weeks, 1 month?”. The answers to these kind of questions are very inaccurate.

• Biased by time and context: Because the participant only fills in a questionnaire once, the patient will also only answer each question once. So the time, place and mood of the patient can greatly influence the answers.

With the Q business intelligence tool, the participant answers questions on his smartphone in a non intrusive way, multiple times a day.