00358nam a2200133 a 450000500170000002000150001708200180003210000210005024500380007126000290010930000160013849000470015470000230020120251203091611.0  a0803933894  a300.723,bste  aStewart, David W  aFocus groups: theory and practice  aNewbury ParkbSagec1990  a154p.c22cm  aApplied social research methods seriesd20  aShamdasani, Prem N