Middle school biology experiments were analyzed by Vee Diagram. Major findings of this study are as follows : 1. Principles were not explit in the most of the experiments. 2. The knowledge included in the experiments has rapid progress when compared with the experimental procedure. 3. The concepts were not consistent with the interaction of knowledge claim and previous knowledge. 4. Though some experiments were improved in the 6th Curriculum, many experiments did not mention value claims.