Well, for example, you can definitely see variations in people's short term memory capacity, basic facilities with dealing with language, and logical problem so

Well, for example, you can definitely see variations in people's short term memory capacity, basic facilities with dealing with language, and logical problem solving skills. And importantly from a clinical perspective you can see when these are mismatched. However these are very reductive variables, and in the real world there are many more things in interacting with each other than these isolated components.