This document discusses using Etherpad, a real-time document collaboration tool, to encourage participation from all students during problem-based learning activities. Etherpad allows multiple users to edit a document simultaneously, includes chat functionality, and supports anonymous contributions. It has technical features like multi-user editing, easy sharing and access, and revision tracking. Socially, it enables anonymous use and immediate feedback. Pedagogically, Etherpad can support social constructivism through synchronous and asynchronous collaboration and encourage participation from quieter students.