00383pab a2200133 454500008004000000100002000040245007600060260000900136300001400145362000800159650003400167650001800201773003000219180718b2002   xxu||||| |||| 00| 0 eng d  aStafford, Bruce  aBeing more certain about random assignment in social policy evaluations  c2002  ap.275-84.  aOct  aGreat Britain - Social policy  aSocial policy  aSocial Policy and Society