Schools around the country have fallen silent today - as the doors are closed to all but the children of "essential workers". After tomorrow, they'll close to all students for at least the next four weeks. How well are schools prepared to deliver online learning, and how much teaching will parents be expected to do? How long can universities realistically deliver lectures and tutorials online? Joining Kathryn is Liam Rutherford, president of the NZEI, Chris Whelan, chief executive of Universities NZ and Chris Perry, president of the New Zealand Principals' Federation.