when one chart analyzes a specific product attribute it is called a univariate chart a chart that measures variances in several product attributes is called a multivariate chart tracking variances allows businesses to see how many defects per production unit they produce and what types of defects are occurring here are a few examples of some methods used 
randomly selected products are tested for the given attributes the chart is tracking a common form of a quality control chart is the x bar chart where the y axis on the graph tracks the degree to which the variance of the tested attribute is acceptable the x axis tracks the samples tested analyzing the variance pattern on this chart helps you determine if defects are occurring randomly or systematically the taguchi method of quality control is another approach that emphasizes the roles of research and development product design and product development in reducing the occurrence of defects and failures in products the taguchi method considers design more important than the manufacturing process in quality control and tries to eliminate variances in production before they can occur this 100 inspection method is a quality control process involving looking at and assessing all product parts this type of quality control is done to rule out flaws in products this method is often used to evaluate valuable metals the 100 inspection method calls for data about the manufacturing process and software to analyze inventory the challenge of using this method is that looking at every single item used to build a product is expensive and could destabilize or render the product unusable for example if you use this method to examine organic strawberries you risk damaging the berries rendering them unsellable quality control methods help standardize production and reactions to quality issues in various industries from food production to automobile manufacturing quality control careersquality control can be a rewarding career if you enjoy working with people communicating presenting results and working to make products better and safer to become a quality control inspector you ll need depending on the industry 2other qualities that are necessary for quality control professionals are the route to a career in quality control and assurance varies by industry so there may be differences however you ll generally need several years of experience in your industry typically you begin by being hired as a quality assurance or control associate after meeting educational and work experience requirements once you gain work experience as a quality specialist or associate you may move into a senior specialist position and begin managing teams of quality control specialists you may attend professional development courses sponsored by your employer or be required to gain certifications such as six sigma 3 you might also need to earn a professional designation such as certified quality inspector 4moving up the career path you have more options you may be able to choose from or be selected to be a these positions can lead up to upper level management or executive levels within quality control the average pay for quality control professionals differs by industry experience and position pay increases as you gain more experience and move into management positions as of may 2023 the bureau of labor statistics reports average salaries as 5