This book constitutes the refereed proceedings of the 6th IFIP World Information Technology Forum, WITFOR 2016, San José, Costa Rica, in September 2016. The 16 full papers and 6 short papers presented were carefully reviewed and selected from 45 submissions. Within the general theme ICT for Promoting Human Development and Protecting the Environment the papers are organized in the following topical sections encompassing the Sustainable Development Goals (SDGs) recently adopted by the United Nations: ICT and cross-cutting development issues; ICT and environmental problems: ICT and human development problems; and ICT and economic development problems.