\karnaughmap{2}{}{
  {\parbox{\kvunitlength}{asynchronous\\(messages)}}
  {written}
  {\parbox{\kvunitlength}{synchronous\\(dialog)}}
  {recorded}
}{
	{\parbox{0.8\kvunitlength}{email\\\NAME{SMS}}}
	{\parbox{0.8\kvunitlength}{voice mail\\video messages}}
	{\parbox{0.8\kvunitlength}{\NAME{IM}\\chat}}
	{\parbox{0.8\kvunitlength}{VoIP\\video conferencing}}
}{}



%\begin{verbatim}
% ---------------------------------------------------
%             |                  |                  |
% messages    |  email           | voicemail        |
% asynchron   |  SMS             | video messages   |
%             |                  |                  |
% ---------------------------------------------------
%             |                  |                  |
% dialog      |  IM              | VoIP             |
% synchron    |  chat            | video conference |
%             |                  |                  |
% ---------------------------------------------------
%             |                  |                  |
%             | written          | recorded         |
%             |                  |                  |
%\end{verbatim}