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122  EMPLOYMENT  PSYCHOLOGY
came  into  the  employment  office  and  those  who  finally
made  good  as  operators.  Secondly,  an  even  finer  distinction ­
  was  made  between  the  groups  of  operators  who
had  survived  at  fast  machines  and  those  who  were  working
at  slow  machines.  Thirdly,  in  every  group  tested,  whether
slow  or  fast,  there  was  a  significant  correlation  between
piece-work  earnings  and  the  performance  in  the  test.
On  the  basis  of  these  conclusions,  therefore,  it  was  decided
to  use  this  test  in  the  employment  office  in  order,  first,
to  eliminate  the  slowest  and  most  clumsy  operators,  and
secondly,  to  classify  the  better  applicants  for  machine
work  of  this  kind  into  two  groups,  those  for  work  on  fast
machines,  and  those  for  work  on  slower  machines.  This  is
now  being  done.