Have done this role a couple of times. You need to make one person responsible for documentation and traceability, because collaborative editing in a wiki like

Have done this role a couple of times. You need to make one person responsible for documentation and traceability, because collaborative editing in a wiki like tool without some editorial oversight and organisation leads to problems later on. The tool really doesn't matter, Confluence works well with Jira, pwiki is nice to use, even sharepoint works in a pinch. Heck, I've even used Enterprise Architect and Mindjet MindManager!