Give a quick analysis on : Six Sigma methodologies and the ISO $9000$ series have different approaches to improving quality in business processes, but they have similarities and differences. Six Sigma is a process improvement methodology that seeks to reduce variability and improve the quality of an organization's products or services. It was developed by Motorola in the $1980$s and popularized by companies such as General Electric. The term "Six Sigma" refers to a statistical level that indicates an extremely low rate of defects in a process, equivalent to no more than $3\mathrm{.}4$ defects per million opportunities. $($Prieto$,2023).$ The methodology is based on the DMAIC $($Define$,$ Measure, Analyze, Improve and Control$)$ cycle and uses statistical tools to identify and eliminate defects, improve efficiency and meet customer expectations.

On the other hand, the ISO $9000$ series is a set of international standards developed by the International Organization for Standardization $($ISO$)$ that establish the requirements for implementing a quality management system $($QMS$).$ The best$-$known standard in this series is ISO $9001.$ These standards provide a general framework to ensure that an organization meets customer requirements, continually improves, and demonstrates compliance with applicable standards and regulations. Implementing a quality management system according to the ISO $9000$ series involves establishing documented processes, conducting internal and external audits, and seeking continuous improvement. $($ISO$,2015).$

It can be concluded that both approaches focus on improving processes that increase efficiency and reduce defects. This leads companies to create products and services with better quality. Despite having the same purpose, these methodologies also have their differences. In the case of Six Sigma, it uses advanced statistical tools to measure and improve the capacity of processes, seeking to reduce variability and minimize defects in specific projects. This methodology leads to almost perfection of quality since it ensures that processes operate with less than $3\mathrm{.}4$ defects per million opportunities. In contrast, the ISO $9000$ series is based on meeting internationally recognized standards and provides a general framework for the establishment of quality management systems. Making it accessible to multiple industries. This tends to be less expensive for medium and small businesses and is recommended for organizations of any size seeking certification to demonstrate compliance with internationally recognized quality standards.