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