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Hi Puneet, I wish I had more context on what you are trying to solve but I agree with Mayank on data collection planning and the matrix. In addition, I thought about structuring an FMEA exercise to get RPNs to prioritize, or you could take an SME group through an NGT session.

Hello Puneet In absence of data for the potential causes listed in fishbone, following approaches could be taken 1. Prepare a data collection plan and start collecting the data (ideally this is done in Measure phase of a project, however we can still do it in Analyze phase). The project timelines might get impacted slightly, but nevertheless we will be able to work with data to identify the critical Xs. 2. Use the Control Impact Matrix to identify the critical Xs. It is subjective in nature, however because it is a group activity the believed that individual biases will be addressed in a group decision. You can read more about it at the below link https://www.benchmarksixsigma.com/forum/topic/36262-control-impact-matrix/ Hope this helps!