Digital Devices (IMAGE) Yale School of the Environment Caption To amass the data necessary for their study, the authors used material flow analysis. They focused on 20 categories of digital devices — including computers, smartphones, digital cameras, and audio-visual equipment — and disassembled dozens of products in a lab in order to determine the relative content of various important elements. Credit Yale School of the Environment Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.