System, a group of parts that work together, Energy, the ability to do work or cause change, Pattern, something that repeats or is predictable, Model, a representation used to explain or test an idea, Constraint, a limit or restriction on a design, Solution, a way to solve a problem, Prototype, an early version of a design used for testing, Conservation, protecting and using resources wisely, Sustainability, using resources in a way that does not harm future generations, Renewable Resource, a resource that can be replaced naturally, Nonrenewable Resource, a resource that cannot be replaced quickly, Natural Resource, materials from Earth used by people (water, air, minerals).

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