This site provides a range of free survey instruments designed to help teachers assess the quality of interactions among their students.

COLLES - the Constructivist On-Line Learning Environment Survey

The COLLES consists of six scales (with 4 questions each) that can measure students perceptions of Relevance, Reflection, Interaction, Tutor Support, Peer Support and Making Sense in your online course. Studying the results in graphic form can provide answers and open up many questions about your own teaching practice.

CLES - the Constructivist Learning Environment Survey

The CLES survey was designed specifically for science classrooms, and includes five scales: "Learning about the world", "Learning about science", "Learning to speak out", "Learning to learn" and "Learning to communicate".