What are the benefits of doing a survey of available materials before making your own materials?

before making your own materials in teaching it is of great help if you conduct a survey of making materials before hand. you are able to provide enhancement based on what you have observed.
saves time.....
you can copy ideas
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What conditions make materials harmful?

Conditions that make material harmful is that when it is used for harming/destroying/killing/polluting the environment and the people.

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What reading material is available on malnutrition?

Beers, Mark H., MD, and Robert Berkow, MD, editors. "Malnutrition." Section 1, Chapter 2. In The Merck Manual of Diagnosis and Therapy. Whitehouse Station, NJ: Merck Research … (MORE)