  We study the capacity regions of two-user interference channels where
transmitters base their transmission schemes on local views of the channel
state. Under the local view model, each transmitter knows only a subset of the
four channel gains, which may be mismatched from the other transmitter.
  We consider a set of seven local views, and find that for five out of the
seven local views, TDM is sufficient to achieve the qualified notion of
capacity region for the linear deterministic interference channel which
approximates the Gaussian interference channel. For these five local views, the
qualified capacity result implies that no policy can achieve a rate point
outside the TDM region without inducing a corner case of sub-TDM performance in
another channel state. The common trait shared by the two remaining local views
- those with the potential to outperform TDM - is transmitter knowledge of the
outgoing interference link accompanied by some common knowledge of state,
emphasizing their importance in creating opportunities to coordinate usage of
more advanced schemes.
  Our conclusions are extended to bounded gap characterizations of the capacity
region for the Gaussian interference channel.
