Information and Communication Technologies for Development. Strengthening Southern-Driven Cooperation as a Catalyst for ICT4DThe two volumes IFIP AICT 551 and 552 constitute the refereed proceedings of the 15th IFIP WG 9. 4 International Conference on Social Implications of Computers in Developing Countries, ICT4D 2019, held in Dar es Salaam, Tanzania, in May 2019. The 97 revised full papers and 2 short papers presented were carefully reviewed and selected from 185 submissions. The papers present a wide range of perspectives and disciplines including (but not limited to)