There are Six Sigma, Lean, Process Quality Methodology, ISO9000 etc mainly used for quality management in project/systems analysis life cycles for process improvements. To be successful it's always said that we must fit out project into the method.
E.g. Six Sigma gives secondary importance to human element where as process quality methodology treats it as primary. Then again, each project has an end user who will be using the end product..
So for typical business IT projects, how can we (systems analysis team) justify which methodology is suitable? It great if any one can direct me to a sample case study that clearly demonstrates evaluation/comparison of the above measures as well as backs up what methodology you've explained is suitable, if possible.