The phrase "one size fits all" is generally applied to what people wear that says the particular article fits a wide range of sizes if not everyone (e.g., watches, baseball caps, belts, etc.). There is something I noticed with the Enneagram types where people try to fit themselves or others into every possible category or concept of the types. The underlying assumption is that the categories or concepts cover the full range of possibilities and completely describe the underlying experience they're attempting to. In other words, everyone can be fit into a type or related concept.
These blog posts are thoughts I have about the Enneagram types and related projects I'm working on. Many of these relate to the Enneagram User Guide series of books. If you'd like to share your thoughts about one of the blog posts then click on the discussion forum topic(s) below the full post.