This paper studies evaluation of the capacity region for interference networks
with point-to-point (p2p) capacity-achieving codes. Such capacity region has
recently been 
characterized as union of several sub-regions each of which has distinctive
operational characteristics. Detailed evaluation of this region, therefore, can
be accomplished in a very simple manner by acknowledging such characteristics,
which, in turn, provides an insight for a simple implementation scenario.
Completely generalized message 
assignment which is also practically relevant is considered in this paper, and
it is shown to provide strictly larger achievable rates than what traditional
message assignment does when a receiver with joint decoding capability is used.