Three psycho-educational principles are outlined (additive bilingual enrichment principle, interdependence principle, and sufficient communicative interactive principle) to illustrate research on the maintenance of Frisian among native speakers and the development of Frisian fluency among native Dutch speakers. (Author/CB)

This article addresses the problem of ascertaining the most suitable learning environment for learning diagnostic skills in health education--specifically diagnostic reasoning and the selection of therapy--through the design, development, and evaluation of a videodisc program. It describes the design, development, and formative evaluation of a…