Multiple Natures begins with a distinction between capacity and cost.
Capacity is whether someone can do the work. Most frameworks stop here. A person with high logical-mathematical intelligence can handle analytical work. A person with strong interpersonal skills can manage relationships well. Capacity answers: can they do it?
Cost is different. Two people with identical capacity for a task can experience it very differently—one finds it energizing, the other finds it draining. Multiple Natures asks: what does it cost them to keep doing it?
This distinction is not a new personality category. It is a new question.