Six-Sigma-Material.com is a popular source for free content. The site focuses on the the methodolgies and tools used within SIx Sigma and Lean Manufacturing.
The site focuses ont the DMAIC path. It covers the most commonly used tools from start to finish. Each topic (such as MSA, ANOVA, Normality Assumption, p-value, DOE, etc) has simple explanations, examples, and practice certification problems. They’re offering a 1 week free trial to access and free and paid content. Per the website, a subscription includes the following.
- Access to all pages within the site. Thousands of pages of material, examples, practice problems, and more added monthly. Your secret source to success.
- We’ll offer to help you (within reason) on particular topics, just send an email.
- Special offers from Six-Sigma-Material or affiliates as available.
- Free downloads throughout the site that are not available to the public.
- “Refer a Friend” discount (scroll down to learn more).
- Group membership discounts
- Cancel anytime
They also have templates, tables, and calculators to help Green Belts and Blacks Belts execute their projects.