Similarly, people who seek to be admitted to an educational system as students would be part of its environment. Parental expectations about what their children should learn in school are also part of the educational system environment. If those expectations are adopted into the curriculum (e.g., learning to use computers), then the expectations have become input.
Things can also be part of the system's environment. For example, textbooks for sale by a commercial publisher to the educational system would be part of its environment.
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