The following tables from the ArchiMate specification tell you the allowable relationships between ArchiMate Enterprise Architecture artifacts – what relationship can be drawn between what two element types. Each letter in the table represents a particular relationship type, per the following legend:
a = (a)ccess c = (c)omposition f = (f)low g = a(g)gregation i = ass(i)gnment n = i(n)fluence o = ass(o)ciation r = (r)ealization s = (s)pecialization t = (t)riggering v = ser(v)ing