@article {5553,
	title = {Design and validity of a portfolio instrument for professional training},
	journal = {Studies in Educational Evaluation},
	volume = {24},
	year = {1998},
	pages = {263-278 },
	keywords = {portfolio, professional, test construction, training, validity},
	url = {http://eric.ed.gov/ERICWebPortal/search/detailmini.jsp?_nfpb=true\&_\&ERICExtSearch_SearchValue_0=EJ576479\&ERICExtSearch_SearchType_0=no\&accno=EJ576479},
	author = {Tillema, H.}
}
