
<PAGE>
                                                                    EXHIBIT 21.1
 
                       LIST OF REGISTRANT'S SUBSIDIARIES
 
<TABLE>
<CAPTION>
NAME                                                                      FEDERAL ID NUMBER
----------------------------------------------------------------------  ----------------------
<S>                                                                     <C>
PATHWAY DESIGN, INC.                                                          04-2780945
MICROFILM PUBLISHING COMPANY                                                  52-0893118
IA ACQUISITION CORPORATION                                                    77-0440943
</TABLE>
