4. The secretariat introduced GRPE-78-02, announcing that the next GRPE session would take place on from 21 to 24 May 2019 and recalling the corresponding deadline (25 February 2019) for the submission of official documents. The Chairs and Secretaries of IWGs were invited to approach the secretariat to define the calendar of IWGs meetings for the May 2019 GRPE session.