00287nam a2200109 a 450000500170000002000150001708200170003210000170004924500580006626000320012430000210015620251203090953.0  a007y666202  a004.21,bwig  aWigander, K.  aStructured analysis and design of information systems  aNew York: McGraw-Hillc1986  aix,277p.c22 cm.