What could digital contact tracing look like?

As New Zealand moves into level two and restrictions lift, the ability to quickly and efficiently trace our contacts will be critical to keeping any future covid outbreaks under control.   But how close is the government's promised contract tracing app? The indications are that the app may be released as early as later this week or early next week and that work is also underway on a digital Covid card concept. Kathryn speaks with Chair of the government's Contact Tracing Assurance Committee Sir Brian Roche and Andrew Chen, an expert in computer systems, a research fellow and part of  Koi Tū, The Centre for Informed Futures at the University of Auckland.