00357nam a2200133 a 450000500170000002000150001708200130003210000240004524500510006926000460012030000260016663000200019263000110021220251202164127.0  a0677055706  a003bMED  aMedina, Barbara  F.  aStructured system analysisbs  a new technique  aNew YorkbGordon and Breach Sciencec1981  axiv,80 p.b22 cm.cPB  aSystem analysis  aSystem