Pedersen, D.2007-11-121990-04-012007-11-121990http://hdl.handle.net/10625/11497Text22 p.enHEALTH SURVEYSMETHODOLOGYPHILOSOPHYEVALUATIONQualitative and quantitative : two styles of viewing the world or two categories of reality?IDRC-Related Report