The following page has resources and links that are critical of constructivism.
This article is called the Con in Constructivism
Why Minimal Guidance During Instruction Does Not
Work: An Analysis of the Failure of Constructivist,
Discovery, Problem-Based, Experiential, and Inquiry-
Paul A. Kirschner, John Sweller & Richard E. Clark
The above article reviews studies and finds evidence against constructivism working. It is worth reading in full. Procedural worked examples work better for students with less background and less knowledge.
Scaffolding and Achievement in Problem-Based and Inquiry Learning:
A Response to Kirschner, Sweller, and Clark (2006)
Cindy E. Hmelo-Silver, Ravit Golan Duncan, and Clark A. Chinn
Department of Educational Psychology
The following blog article sets out to refute the above Sweller study.
More on Sweller approach.
Notes at this blog on Sweller paper.
Direct Instruction vs. Discovery:
The Long View
DAVID DEAN JR., DEANNA KUHN
Teachers College, Columbia University, New York, NY 10027, USA