Making sense was funded by the European Commission within the H2020 Call ICT2015 Research and Innovation. It was designed to show how open-source hardware and software, digital maker practices and open-source design principles could be used effectively by local communities to appropriate their own technological sensing tools to make sense of their environment to address environmental issues concerning air, water, soil and sound pollution. Based on nine pilots in Amsterdam, Barcelona and Prishtina, Making Sense developed a toolkit for participatory sensing aimed at deepening understanding of the processes which might enable collective awareness. This book is part of that toolkit.