The University of Dar es Salaam and Addis Ababa University signed a Memorandum of Understanding on a collaboration to teach Kiswahili early this week. The MoU, signed by UDSM Vice Chancellor Prof. William Anangisye, and the President of Addis Ababa University, Prof. Tassew Woldehanna, follows a decision by the AU to adopt Kiswahili as its official working language recently.