The test and trace systems in operation in many countries are a key strategy to lower the reproduction rate and control the virus, with technology enabling measures such as tracing of close contacts, notifying local alerts, and venue check-ins using QR codes. From your technological expertise, how do you see these systems working, and do you see any alternatives which should be explored?Mariarosaria Taddeo (MT): In my work, I'm most concerned with the ethical and social implications of these kinds of technological interventions. When the first app was about to be released, the Digital Ethics Lab (in which I serve as Deputy Director) focused on what are the requirements that these kinds of apps need to respect to ensure that they will be ethically sound. For these apps, being ethically sound is important because, as we saw with the failure of the first app if citizens do not deem the app ethical, they do not trust it and do not adopt it. In this case, the efforts, funds, and time invested in developing the app will turn into missed opportunities; in turn, this will hinder government reputation. So, ensuring that these apps respect fundamental values and rights (i.e., are ethically sound) is vital.