Criteria and Constraints

Defining Problems Energy and Matter Engineering

The Science and Engineering Practice of Asking Questions and Defining Problems asks students to identify the criteria and constraints presented by a given problem.  Criteria and constraints are both aspects of a problem that limit a solution.  Students should be started to identify these components starting in 3rd grade. Criteria Part of the engineering design …

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Unobservable Scales and Mechanisms in NGSS

Developing and Using Models Energy and Matter Middle School Scale, Proportion and Quantity Uncategorized

I first ran across the terms “unobservable scales” and “unobservable mechanisms” early in my NGSS journey.  I had no idea what these were. A  google search didn’t provide any answers.  Read this post to find out what the terms unobservable scales and mechanisms mean in the NGSS. Where do these terms appear in the NGSS? …

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