Few topics in education have generated as much interest as portfolios. To assist the many educators who are experimenting with this concept, the Test Center at Northwest Regional Educational Laboratory has prepared this annotated bibliography of articles on portfolios in educational assessment. The articles (more than 240) are listed in alphabetical order by primary author. An index helps users find relevant references, and a set of descriptors is used to help locate material. Each entry is classified according to article focus, purpose, subject area covered, grade level, type of portfolio, features of the assessment system, and professional uses. Documents in the bibliography may be obtained from the sources listed for each entry, although in Alaska, Idaho, Montana, Oregon, and Washington, documents can be borrowed from the Test Center. Articles cover both student and staff portfolios and provide articles on theory and actual practice. Examples are given for all grade levels and for many subject areas. (SLD)