摘要：This study used meta-analysis to synthesize the effectiveness of the project approach. After reviewing 51 studies,we analyzed the effect size of 119 articles published between 1990 and 2002 using SAS 8.2 program. The grand average of the project approach effectiveness was 1.03. This implies that the experimental group that employing the project approach is more effective than control group by the 35 percentile. We also found that the project approach is more effective for preschool children group (1.21,89%) than for the elementary school children group (0.88,81%). Specific variables regarding the effectiveness of the project approach were analyzed and its consequences were discussed.
