Collaborative writing involves two or more writers synthesizing their perspectives to create a new shared voice and texts. It has three qualities - reflexive dialogue where writers discuss their work, invention where they create texts to explore ideas, and continuity of working together. Collaborative writing is becoming more common with projects like Wikipedia. It has value for learning as writing can aid in thinking and sharing of ideas. The document then discusses trying collaborative composition through free writing and brainstorming advantages and concerns before considering different models of collaborative writing.