Effectiveness is when an input results in successfully producing a desired or intended result .
An effective school health program is one which simultaneously improves children’s health, well-being and education and is also cost effective.
Among the most effective school health programs are those that promote mental health, healthy eating and physical activity.
The effectiveness of health promoting schools can be difficult to measure.
A systematic review of studies on the effectiveness of school health promotion efforts, further concluded that programmes that account for contextual factors, emphasize multidimensional approaches and sustained are more likely to be effective in terms of health outcomes.
For more information on the effectiveness of health promoting schools see http://www.euro.who.int/__data/assets/pdf_file/0007/74653/E88185.pdf