Marc, 
 
I'm still confused about the meaning of behavior in Archimate. E.g. the ArchiMate documentation states: "The language consists of active structure elements, behavioral elements and passive structure elements. The active structure elements are the business actors, application components and devices that display actual behavior, i.e., the ‘subjects’ of activity (right side of the Figure 3). Then there is the behavioral or dynamic aspect (center of Figure 3). The active structure concepts are assigned to behavioral concepts, to show who or what performs the behavior." 
For me it is very strange (and confusing) that the things that perform behavior (the subjects of activity) are not the behavioral concepts...  
 
You state in the article: "The separations between internal and external, and between structure(active & passive) and behaviour are central to ArchiMate." So I was hoping to see some clearer examples of the differences between behavior modeling and structural modeling with ArchiMate. For me the examples in the good practices section are more a way to model the structure of the high-level activities then to show behavior.