Appendix A:                   ESTIMATING INTERNATIONAL MIGRATION--A SYNOPSIS

Source:  U.S. Bureau of the Census
Internet Release date:  June 20, 1997


         CATEGORY         EFFECT on         METHOD of PREPARING IMMIGRATION ESTIMATES
                          CENSUS
                                             NATIONAL                 STATES/COUNTIES/PLACES

A.  CATEGORIES OF INTERNATIONAL MIGRATION ASSIGNED TO SPECIFIC AREAS IN U.S.

 1.  Legal                Yes        Directly from            1980 Census Distribution with
     Immigration                     INS Data; about          Proration to National Estimate
                                     600,000 per year

 2.  Undocumented         Yes        Demographic Analysis;    1980 Census Distribution with
     Immigration                     a constant of 200,000    Proration to National Estimate
                                     per year

 3.  Emigration           Yes        Demographic Analysis;    1980 Census Distribution with
                                     a constant of 160,000    Proration to National Estimate for 
                                     per year                 Immigrants; Native born emigrants
                                                              subsumed in tax match operation

 4.  Puerto Rican         Yes        Airline Passenger        1980 Census Distribution with
     Migration                       Data; up to 40,000       Proration to National Estimate
                                     per year

B.  CATEGORIES OF INTERNATIONAL MIGRATION NOT ASSIGNED TO SPECIFIC LOCATIONS IN U.S.

 5.  Armed Forces         Yes        Dept. of Defense         Subsumed in Tax Matching Process
     and Dependents                  stock data; near
                                     zero for most of
                                     1980's but over
                                     200,000 for Desert
                                     Storm



Appendix A: (cont'd)          ESTIMATING INTERNATIONAL MIGRATION--A SYNOPSIS

         CATEGORY         EFFECT on         METHOD of PREPARING IMMIGRATION ESTIMATES
                          CENSUS
                                             NATIONAL                 STATES/COUNTIES/PLACES

B.  CATEGORIES OF INTERNATIONAL MIGRATION NOT ASSIGNED TO SPECIFIC LOCATIONS IN U.S.  (cont'd)

 6.  Civ. Federal         Yes        OMP stock data;          Subsumed in Tax Matching Process
     Employees and                   about 20,000 per
     Dependents                      year to U.S.

 7.  Non Federal          Yes        None                     Probably subsumed in Tax Matching
     Employees and                                            Process
     Dependents

 8.  Students             Yes        None                     Probably subsumed in Tax Matching
                                                              Process

 9.  Visitors             No         None                     None