ISO 9000 is a family of standards that includes ISO 9001 among others. ISO 9001 is the standard within the ISO 9000 family that can be certified and contains the ISO requirements for a quality management system.

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Below is a link to study that suggests mixed financial outcomes for companies implementing Six Sigma practices. The most interesting finding is that Six Sigma may be more effective in companies that already have strong cash flows than in companies that generate little cash. https://medium.com/business-process-management-software-comparisons/the-demise-of-six-sigma-the-right-sizing-of-a-problem-solving-methodology-4e49b4442bf7

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