How to participate?

First, you need to be over 18 years old and possessing a phone running Android OS (version 4.1 or higher). Then you can download the app from the Google App Store (just search MACACO) and install it. In order to start your participation you need to agree with our terms that will be clearly presented to you. In case you have any questions, do not hesitate to contact us ( Once you have installed the application and agreed with the terms, the application will run on your phone. Now you can safely resume using your phone as you did before the application was installed. The application will run quietly in the background. To participate of the questionnaire, just open the MACACO application and click on the questionnaire link from the main menu. A browser will then show the questions on our secure website.

Unfortunately, due to a wide variety of phones, we cannot guarantee that the application will run flawlessly on your specific phone, but we welcome any feedback and will try to fix any application errors as soon as possible.