Strategic Domain Modeling Focusing on Observable Behavior

Today I had an interesting discussion with one of my architects regarding the relationship between sub-domains and bounded context, the role of the ubiquitous language and the role of event modeling to help us focus on the observable behavior in our system.
 
I used the following info graphic to convey my thoughts:

Probably not self-explanatory, but hopefully somewhat helpful. I will probably write a separate post to further explain my ideas.