These proceedings include tutorials and papers presented at the Sixth CSR Confer- ence on the topic of Large Software Systems. The aim of the Conference was to identify solutions to the problems of developing and maintaining large software systems, based on approaches which are currently being undertaken by software practitioners. These proceedings are intended to make these solutions more widely available to the software industry. The papers from software practitioners describe: * important working systems, highlighting their problems and successes; * techniques for large system development...