The Frame of Association is used to explore any associations and relationships between two or more subjects. It can also be use to form brand new relationships between related subjects or even unrelated subjects.
Typical thinking prompts might be:
How are these things associated?
How does A relate to B?
What could these things have in common with each other?
See: What Are Thinking Prompts and What Can They Do for Your Knowledge and Understanding of a Subject
Note: By using the word could means that you are also using The Frame of What If and Possibility. It says that you looking for possible relationships that could be true but not necessarily are true.
To explore more frames see: A List of Ways You Can Frame and Reframe Thoughts and Information