1. Content analysis of online discussion on a senior-high-school discussion forum of a virtual physics laboratory

   • Ying-Hua Guan
   • Chin-Chung Tsai
   • Fu-Kwun Hwang

   OriginalPaper Pages: 279 - 311

2. Inter-relations of tutor’s and peers’ scaffolding and decision-making discourse acts

   • Kai Pata
   • Erno Lehtinen
   • Tago Sarapuu

   OriginalPaper Pages: 313 - 341

3. Altering the Modality of Instructions to Facilitate Imagination: Interactions between the Modality and Imagination Effects

   • Sharon Tindall-Ford
   • John Sweller

   OriginalPaper Pages: 343 - 365