PT Journal AU Glahn, C TI Contextual support of social engagement and reflection on the Web SO eleed PY 2010 VL 6 IS 1 DE TENCompetence; WWW; Worldwide Web; activity tracking; competence development; context; design research; incidental learning; information visualization; mash-up; motivation; reflection; self-directed learning; self-organized learning; situated learning; social software; system architecture; thesis; web 2.0 ER