Lomoarcpsd|98729 8 backs in school for physical education programs. Lead to binge eating and purging increase risk of obesity: helps for parents to encourage physical activity. Parents fail to recognize their children"s weight categories. Piaget thought this was most important part of stage. Inductive logic: type of reasoning in which general principles are inferred from specific experiences. Deductive logic: type of reasoning based on hypothetical premises that requires predicting a specific outcome from a general principle. Concrete stage children not good at this only good with things they can see, not hypothetical. Researchers agree with piaget that concrete operational schemes are acquired over 6-12 year old period. Conservation of mass by age 7, conservation of volume by age 11, Class inclusion: understanding that subordinate classes are included in larger, subordinate classes. No stages, just sequences, problem solving rules emerge from experience, develop 4 rules. Rule 2: transitional, add a couple more dimensions.