This issue of LEISA is dedicated to documentation processes: how they contribute to the generation of new knowledge, and how they help people reflect on and improve their activities. This issue highlights examples of documentation in a range of field projects, and communication media from photography and participatory video to written case studies and oral testimonies or histories. The articles show how documentation can be done by anyone involved in a project, and can be more than just descriptive. Good documentation processes form part of wider monitoring and evaluation activities, and are essential for sharing knowledge and good practice with others