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With the benefits of scaffolding firmly established, research progressed to discovering conditions and features that optimize its effectiveness. These high ecological validity studies make a contribution but cannot be synthesized by traditional meta-analysis approaches. The purpose of this study is to synthesize quasi-experimental and experimental designs in the area of computer-based scaffolding, building on what is known from prior review work through an informed prior distribution. Results suggest that fading (N=4) scaffolds is less effective (g = 0.56) than a combination of fading and adding (N = 12; g = 0.60). When adding support (N = 2) scaffolded students learn less than control students (g = -0.80). Implications for these findings and their relationship to existing theory are discussed.