User-centered design has been implemented from the start of the project. Potential users were asked for their feedback both via questionnaires and focus interviews. Important usability feedback was received through the World Health Organization that used the device in developing countries for assessing the impact of vaccination against human papilloma virus, causing cervical cancer. Recently, collaborations with living labs Happy Ageing and EIZT have been set-up to further improve the Colli-Pee design and usability according to user needs.