A freeware and open source SEN-related observation tool. The <ahref="https://www.internationalsengroup.org/tsf_web/"target="_blank">web version is available here</a> (now works on iPads too).
For a detailed manual on how to use the Time Sampling Form, please go to <ahref="https://docs.internationalsengroup.org/tsf.html"target="_blank">this page on the ISENG website</a>.